diff --git a/fsm-diff-vis/d3.v7.min.js b/fsm-diff-vis/d3.v7.min.js
new file mode 100644
index 0000000..33bb880
--- /dev/null
+++ b/fsm-diff-vis/d3.v7.min.js
@@ -0,0 +1,2 @@
+// https://d3js.org v7.9.0 Copyright 2010-2023 Mike Bostock
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n=0;n<o;n++)this._dists[n]=Eu(t[2*n],t[2*n+1],w.x,w.y);Cu(this._ids,this._dists,0,o-1),this._hullStart=h;let M=3;e[h]=n[p]=d,e[d]=n[h]=p,e[p]=n[d]=h,r[h]=0,r[d]=1,r[p]=2,i.fill(-1),i[this._hashKey(g,y)]=h,i[this._hashKey(v,_)]=d,i[this._hashKey(m,x)]=p,this.trianglesLen=0,this._addTriangle(h,d,p,-1,-1,-1);for(let o,a,u=0;u<this._ids.length;u++){const c=this._ids[u],f=t[2*c],s=t[2*c+1];if(u>0&&Math.abs(f-o)<=Tu&&Math.abs(s-a)<=Tu)continue;if(o=f,a=s,c===h||c===d||c===p)continue;let l=0;for(let t=0,n=this._hashKey(f,s);t<this._hashSize&&(l=i[(n+t)%this._hashSize],-1===l||l===e[l]);t++);l=n[l];let g,y=l;for(;g=e[y],Mu(f,s,t[2*y],t[2*y+1],t[2*g],t[2*g+1])>=0;)if(y=g,y===l){y=-1;break}if(-1===y)continue;let v=this._addTriangle(y,c,e[y],-1,-1,r[y]);r[c]=this._legalize(v+2),r[y]=v,M++;let _=e[y];for(;g=e[_],Mu(f,s,t[2*_],t[2*_+1],t[2*g],t[2*g+1])<0;)v=this._addTriangle(_,c,g,r[c],-1,r[_]),r[c]=this._legalize(v+2),e[_]=_,M--,_=g;if(y===l)for(;g=n[y],Mu(f,s,t[2*g],t[2*g+1],t[2*y],t[2*y+1])<0;)v=this._addTriangle(g,c,y,-1,r[y],r[g]),this._legalize(v+2),r[g]=v,e[y]=y,M--,y=g;this._hullStart=n[c]=y,e[y]=n[_]=c,e[c]=_,i[this._hashKey(f,s)]=c,i[this._hashKey(t[2*y],t[2*y+1])]=y}this.hull=new Uint32Array(M);for(let t=0,n=this._hullStart;t<M;t++)this.hull[t]=n,n=e[n];this.triangles=this._triangles.subarray(0,this.trianglesLen),this.halfedges=this._halfedges.subarray(0,this.trianglesLen)}_hashKey(t,n){return Math.floor(function(t,n){const e=t/(Math.abs(t)+Math.abs(n));return(n>0?3-e:1+e)/4}(t-this._cx,n-this._cy)*this._hashSize)%this._hashSize}_legalize(t){const{_triangles:n,_halfedges:e,coords:r}=this;let i=0,o=0;for(;;){const a=e[t],u=t-t%3;if(o=u+(t+2)%3,-1===a){if(0===i)break;t=Au[--i];continue}const c=a-a%3,f=u+(t+1)%3,s=c+(a+2)%3,l=n[o],h=n[t],d=n[f],p=n[s];if(Nu(r[2*l],r[2*l+1],r[2*h],r[2*h+1],r[2*d],r[2*d+1],r[2*p],r[2*p+1])){n[t]=p,n[a]=l;const r=e[s];if(-1===r){let n=this._hullStart;do{if(this._hullTri[n]===s){this._hullTri[n]=t;break}n=this._hullPrev[n]}while(n!==this._hullStart)}this._link(t,r),this._link(a,e[o]),this._link(o,s);const u=c+(a+1)%3;i<Au.length&&(Au[i++]=u)}else{if(0===i)break;t=Au[--i]}}return o}_link(t,n){this._halfedges[t]=n,-1!==n&&(this._halfedges[n]=t)}_addTriangle(t,n,e,r,i,o){const a=this.trianglesLen;return this._triangles[a]=t,this._triangles[a+1]=n,this._triangles[a+2]=e,this._link(a,r),this._link(a+1,i),this._link(a+2,o),this.trianglesLen+=3,a}}function Eu(t,n,e,r){const i=t-e,o=n-r;return i*i+o*o}function Nu(t,n,e,r,i,o,a,u){const c=t-a,f=n-u,s=e-a,l=r-u,h=i-a,d=o-u,p=s*s+l*l,g=h*h+d*d;return c*(l*g-p*d)-f*(s*g-p*h)+(c*c+f*f)*(s*d-l*h)<0}function ku(t,n,e,r,i,o){const a=e-t,u=r-n,c=i-t,f=o-n,s=a*a+u*u,l=c*c+f*f,h=.5/(a*f-u*c),d=(f*s-u*l)*h,p=(a*l-c*s)*h;return d*d+p*p}function Cu(t,n,e,r){if(r-e<=20)for(let i=e+1;i<=r;i++){const r=t[i],o=n[r];let a=i-1;for(;a>=e&&n[t[a]]>o;)t[a+1]=t[a--];t[a+1]=r}else{let i=e+1,o=r;Pu(t,e+r>>1,i),n[t[e]]>n[t[r]]&&Pu(t,e,r),n[t[i]]>n[t[r]]&&Pu(t,i,r),n[t[e]]>n[t[i]]&&Pu(t,e,i);const a=t[i],u=n[a];for(;;){do{i++}while(n[t[i]]<u);do{o--}while(n[t[o]]>u);if(o<i)break;Pu(t,i,o)}t[e+1]=t[o],t[o]=a,r-i+1>=o-e?(Cu(t,n,i,r),Cu(t,n,e,o-1)):(Cu(t,n,e,o-1),Cu(t,n,i,r))}}function Pu(t,n,e){const r=t[n];t[n]=t[e],t[e]=r}function zu(t){return t[0]}function $u(t){return t[1]}const Du=1e-6;class Ru{constructor(){this._x0=this._y0=this._x1=this._y1=null,this._=""}moveTo(t,n){this._+=`M${this._x0=this._x1=+t},${this._y0=this._y1=+n}`}closePath(){null!==this._x1&&(this._x1=this._x0,this._y1=this._y0,this._+="Z")}lineTo(t,n){this._+=`L${this._x1=+t},${this._y1=+n}`}arc(t,n,e){const r=(t=+t)+(e=+e),i=n=+n;if(e<0)throw new Error("negative radius");null===this._x1?this._+=`M${r},${i}`:(Math.abs(this._x1-r)>Du||Math.abs(this._y1-i)>Du)&&(this._+="L"+r+","+i),e&&(this._+=`A${e},${e},0,1,1,${t-e},${n}A${e},${e},0,1,1,${this._x1=r},${this._y1=i}`)}rect(t,n,e,r){this._+=`M${this._x0=this._x1=+t},${this._y0=this._y1=+n}h${+e}v${+r}h${-e}Z`}value(){return this._||null}}class Fu{constructor(){this._=[]}moveTo(t,n){this._.push([t,n])}closePath(){this._.push(this._[0].slice())}lineTo(t,n){this._.push([t,n])}value(){return this._.length?this._:null}}class qu{constructor(t,[n,e,r,i]=[0,0,960,500]){if(!((r=+r)>=(n=+n)&&(i=+i)>=(e=+e)))throw new Error("invalid bounds");this.delaunay=t,this._circumcenters=new Float64Array(2*t.points.length),this.vectors=new Float64Array(2*t.points.length),this.xmax=r,this.xmin=n,this.ymax=i,this.ymin=e,this._init()}update(){return this.delaunay.update(),this._init(),this}_init(){const{delaunay:{points:t,hull:n,triangles:e},vectors:r}=this;let i,o;const a=this.circumcenters=this._circumcenters.subarray(0,e.length/3*2);for(let r,u,c=0,f=0,s=e.length;c<s;c+=3,f+=2){const s=2*e[c],l=2*e[c+1],h=2*e[c+2],d=t[s],p=t[s+1],g=t[l],y=t[l+1],v=t[h],_=t[h+1],b=g-d,m=y-p,x=v-d,w=_-p,M=2*(b*w-m*x);if(Math.abs(M)<1e-9){if(void 0===i){i=o=0;for(const e of n)i+=t[2*e],o+=t[2*e+1];i/=n.length,o/=n.length}const e=1e9*Math.sign((i-d)*w-(o-p)*x);r=(d+v)/2-e*w,u=(p+_)/2+e*x}else{const t=1/M,n=b*b+m*m,e=x*x+w*w;r=d+(w*n-m*e)*t,u=p+(b*e-x*n)*t}a[f]=r,a[f+1]=u}let u,c,f,s=n[n.length-1],l=4*s,h=t[2*s],d=t[2*s+1];r.fill(0);for(let e=0;e<n.length;++e)s=n[e],u=l,c=h,f=d,l=4*s,h=t[2*s],d=t[2*s+1],r[u+2]=r[l]=f-d,r[u+3]=r[l+1]=h-c}render(t){const n=null==t?t=new Ru:void 0,{delaunay:{halfedges:e,inedges:r,hull:i},circumcenters:o,vectors:a}=this;if(i.length<=1)return null;for(let n=0,r=e.length;n<r;++n){const r=e[n];if(r<n)continue;const i=2*Math.floor(n/3),a=2*Math.floor(r/3),u=o[i],c=o[i+1],f=o[a],s=o[a+1];this._renderSegment(u,c,f,s,t)}let u,c=i[i.length-1];for(let n=0;n<i.length;++n){u=c,c=i[n];const e=2*Math.floor(r[c]/3),f=o[e],s=o[e+1],l=4*u,h=this._project(f,s,a[l+2],a[l+3]);h&&this._renderSegment(f,s,h[0],h[1],t)}return n&&n.value()}renderBounds(t){const n=null==t?t=new Ru:void 0;return t.rect(this.xmin,this.ymin,this.xmax-this.xmin,this.ymax-this.ymin),n&&n.value()}renderCell(t,n){const e=null==n?n=new Ru:void 0,r=this._clip(t);if(null===r||!r.length)return;n.moveTo(r[0],r[1]);let i=r.length;for(;r[0]===r[i-2]&&r[1]===r[i-1]&&i>1;)i-=2;for(let t=2;t<i;t+=2)r[t]===r[t-2]&&r[t+1]===r[t-1]||n.lineTo(r[t],r[t+1]);return n.closePath(),e&&e.value()}*cellPolygons(){const{delaunay:{points:t}}=this;for(let n=0,e=t.length/2;n<e;++n){const t=this.cellPolygon(n);t&&(t.index=n,yield t)}}cellPolygon(t){const n=new Fu;return this.renderCell(t,n),n.value()}_renderSegment(t,n,e,r,i){let o;const a=this._regioncode(t,n),u=this._regioncode(e,r);0===a&&0===u?(i.moveTo(t,n),i.lineTo(e,r)):(o=this._clipSegment(t,n,e,r,a,u))&&(i.moveTo(o[0],o[1]),i.lineTo(o[2],o[3]))}contains(t,n,e){return(n=+n)==n&&(e=+e)==e&&this.delaunay._step(t,n,e)===t}*neighbors(t){const n=this._clip(t);if(n)for(const e of this.delaunay.neighbors(t)){const t=this._clip(e);if(t)t:for(let r=0,i=n.length;r<i;r+=2)for(let o=0,a=t.length;o<a;o+=2)if(n[r]===t[o]&&n[r+1]===t[o+1]&&n[(r+2)%i]===t[(o+a-2)%a]&&n[(r+3)%i]===t[(o+a-1)%a]){yield e;break t}}}_cell(t){const{circumcenters:n,delaunay:{inedges:e,halfedges:r,triangles:i}}=this,o=e[t];if(-1===o)return null;const a=[];let u=o;do{const e=Math.floor(u/3);if(a.push(n[2*e],n[2*e+1]),u=u%3==2?u-2:u+1,i[u]!==t)break;u=r[u]}while(u!==o&&-1!==u);return a}_clip(t){if(0===t&&1===this.delaunay.hull.length)return[this.xmax,this.ymin,this.xmax,this.ymax,this.xmin,this.ymax,this.xmin,this.ymin];const n=this._cell(t);if(null===n)return null;const{vectors:e}=this,r=4*t;return this._simplify(e[r]||e[r+1]?this._clipInfinite(t,n,e[r],e[r+1],e[r+2],e[r+3]):this._clipFinite(t,n))}_clipFinite(t,n){const e=n.length;let r,i,o,a,u=null,c=n[e-2],f=n[e-1],s=this._regioncode(c,f),l=0;for(let h=0;h<e;h+=2)if(r=c,i=f,c=n[h],f=n[h+1],o=s,s=this._regioncode(c,f),0===o&&0===s)a=l,l=0,u?u.push(c,f):u=[c,f];else{let n,e,h,d,p;if(0===o){if(null===(n=this._clipSegment(r,i,c,f,o,s)))continue;[e,h,d,p]=n}else{if(null===(n=this._clipSegment(c,f,r,i,s,o)))continue;[d,p,e,h]=n,a=l,l=this._edgecode(e,h),a&&l&&this._edge(t,a,l,u,u.length),u?u.push(e,h):u=[e,h]}a=l,l=this._edgecode(d,p),a&&l&&this._edge(t,a,l,u,u.length),u?u.push(d,p):u=[d,p]}if(u)a=l,l=this._edgecode(u[0],u[1]),a&&l&&this._edge(t,a,l,u,u.length);else if(this.contains(t,(this.xmin+this.xmax)/2,(this.ymin+this.ymax)/2))return[this.xmax,this.ymin,this.xmax,this.ymax,this.xmin,this.ymax,this.xmin,this.ymin];return u}_clipSegment(t,n,e,r,i,o){const a=i<o;for(a&&([t,n,e,r,i,o]=[e,r,t,n,o,i]);;){if(0===i&&0===o)return a?[e,r,t,n]:[t,n,e,r];if(i&o)return null;let u,c,f=i||o;8&f?(u=t+(e-t)*(this.ymax-n)/(r-n),c=this.ymax):4&f?(u=t+(e-t)*(this.ymin-n)/(r-n),c=this.ymin):2&f?(c=n+(r-n)*(this.xmax-t)/(e-t),u=this.xmax):(c=n+(r-n)*(this.xmin-t)/(e-t),u=this.xmin),i?(t=u,n=c,i=this._regioncode(t,n)):(e=u,r=c,o=this._regioncode(e,r))}}_clipInfinite(t,n,e,r,i,o){let a,u=Array.from(n);if((a=this._project(u[0],u[1],e,r))&&u.unshift(a[0],a[1]),(a=this._project(u[u.length-2],u[u.length-1],i,o))&&u.push(a[0],a[1]),u=this._clipFinite(t,u))for(let n,e=0,r=u.length,i=this._edgecode(u[r-2],u[r-1]);e<r;e+=2)n=i,i=this._edgecode(u[e],u[e+1]),n&&i&&(e=this._edge(t,n,i,u,e),r=u.length);else this.contains(t,(this.xmin+this.xmax)/2,(this.ymin+this.ymax)/2)&&(u=[this.xmin,this.ymin,this.xmax,this.ymin,this.xmax,this.ymax,this.xmin,this.ymax]);return u}_edge(t,n,e,r,i){for(;n!==e;){let e,o;switch(n){case 5:n=4;continue;case 4:n=6,e=this.xmax,o=this.ymin;break;case 6:n=2;continue;case 2:n=10,e=this.xmax,o=this.ymax;break;case 10:n=8;continue;case 8:n=9,e=this.xmin,o=this.ymax;break;case 9:n=1;continue;case 1:n=5,e=this.xmin,o=this.ymin}r[i]===e&&r[i+1]===o||!this.contains(t,e,o)||(r.splice(i,0,e,o),i+=2)}return i}_project(t,n,e,r){let i,o,a,u=1/0;if(r<0){if(n<=this.ymin)return null;(i=(this.ymin-n)/r)<u&&(a=this.ymin,o=t+(u=i)*e)}else if(r>0){if(n>=this.ymax)return null;(i=(this.ymax-n)/r)<u&&(a=this.ymax,o=t+(u=i)*e)}if(e>0){if(t>=this.xmax)return null;(i=(this.xmax-t)/e)<u&&(o=this.xmax,a=n+(u=i)*r)}else if(e<0){if(t<=this.xmin)return null;(i=(this.xmin-t)/e)<u&&(o=this.xmin,a=n+(u=i)*r)}return[o,a]}_edgecode(t,n){return(t===this.xmin?1:t===this.xmax?2:0)|(n===this.ymin?4:n===this.ymax?8:0)}_regioncode(t,n){return(t<this.xmin?1:t>this.xmax?2:0)|(n<this.ymin?4:n>this.ymax?8:0)}_simplify(t){if(t&&t.length>4){for(let n=0;n<t.length;n+=2){const e=(n+2)%t.length,r=(n+4)%t.length;(t[n]===t[e]&&t[e]===t[r]||t[n+1]===t[e+1]&&t[e+1]===t[r+1])&&(t.splice(e,2),n-=2)}t.length||(t=null)}return t}}const Uu=2*Math.PI,Iu=Math.pow;function Ou(t){return t[0]}function Bu(t){return t[1]}function Yu(t,n,e){return[t+Math.sin(t+n)*e,n+Math.cos(t-n)*e]}class Lu{static from(t,n=Ou,e=Bu,r){return new Lu("length"in t?function(t,n,e,r){const i=t.length,o=new Float64Array(2*i);for(let a=0;a<i;++a){const i=t[a];o[2*a]=n.call(r,i,a,t),o[2*a+1]=e.call(r,i,a,t)}return o}(t,n,e,r):Float64Array.from(function*(t,n,e,r){let i=0;for(const o of t)yield n.call(r,o,i,t),yield e.call(r,o,i,t),++i}(t,n,e,r)))}constructor(t){this._delaunator=new Su(t),this.inedges=new Int32Array(t.length/2),this._hullIndex=new Int32Array(t.length/2),this.points=this._delaunator.coords,this._init()}update(){return this._delaunator.update(),this._init(),this}_init(){const t=this._delaunator,n=this.points;if(t.hull&&t.hull.length>2&&function(t){const{triangles:n,coords:e}=t;for(let t=0;t<n.length;t+=3){const 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diff --git a/fsm-diff-vis/index.html b/fsm-diff-vis/index.html
new file mode 100644
index 0000000..dcff4ae
--- /dev/null
+++ b/fsm-diff-vis/index.html
@@ -0,0 +1,280 @@
+<!DOCTYPE html>
+<body style="background:#fab;">
+<div id="container" style="margin:auto;width:700px;background:#fff"></div>
+<form style="margin:auto;width:700px;background:#eee;">distance: <input type="range" min="1" max="300" value="150" class="slider" id="distance">
+  <p>Bovenaan staat de begintoestand. Onderaan een sink-toestand. Lijnen van een toestand naar zichzelf kunnen niet getekend worden. Geel en blauw zijn voor de twee modellen. Toestanden die vergelijkbaar zijn worden vanzelf groen. Je kunt punten verslepen, daarna staan ze vast. Nog eens klikken en zo komen weer los. Dit maakt gebruikt van <a href="https://d3js.org">d3.js</a> met de "force-directed graph layout", het werkt eigenlijk niet zo heel goed voor dit soort modellen. <a href="https://git.cs.ou.nl/joshua.moerman/fsm-diff-vis/">Source</a>.</p>
+</form>
+<script src="d3.v7.min.js"></script>
+<script type="module">
+
+// De twee modellen van DTLS zetten we direct hier neer. Deze transities komen
+// direct uit de .dot file. Het meeste hier is hard-coded.
+const alphabet = ["HELLO", "KEX", "CIPH", "FIN", "APP", "AL_W", "AL_F"];
+
+const states1 = ["s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", "s8", "s9", "s10", "s11", "s12"];
+const transitions1 = [["s0", "s2", "HELLO", "HELLO_VERIFY_REQUEST"], ["s0", "s0", "KEX", "TO"], ["s0", "s1", "CIPH", "TO"], ["s0", "s0", "FIN", "TO"], ["s0", "s0", "APP", "TO"], ["s0", "s0", "AL_W", "TO"], ["s0", "s0", "AL_F", "TO"], ["s1", "s1", "HELLO", "TO"], ["s1", "s1", "KEX", "TO"], ["s1", "s1", "CIPH", "TO"], ["s1", "s1", "FIN", "TO"], ["s1", "s1", "APP", "TO"], ["s1", "s1", "AL_W", "TO"], ["s1", "s1", "AL_F", "TO"], ["s2", "s3", "HELLO", "SER_HELLO_DONE"], ["s2", "s2", "KEX", "TO"], ["s2", "s1", "CIPH", "TO"], ["s2", "s2", "FIN", "TO"], ["s2", "s2", "APP", "TO"], ["s2", "s2", "AL_W", "TO"], ["s2", "s2", "AL_F", "TO"], ["s3", "s7", "HELLO", "TO"], ["s3", "s4", "KEX", "TO"], ["s3", "s1", "CIPH", "TO"], ["s3", "s2", "FIN", "INT_ERR"], ["s3", "s3", "APP", "TO"], ["s3", "s2", "AL_W", "AL_W"], ["s3", "s2", "AL_F", "TO"], ["s4", "s8", "HELLO", "TO"], ["s4", "s2", "KEX", "INT_ERR"], ["s4", "s5", "CIPH", "TO"], ["s4", "s2", "FIN", "INT_ERR"], ["s4", "s4", "APP", "TO"], ["s4", "s2", "AL_W", "AL_W"], ["s4", "s2", "AL_F", "TO"], ["s5", "s1", "HELLO", "INT_ERR"], ["s5", "s1", "KEX", "INT_ERR"], ["s5", "s1", "CIPH", "INT_ERR"], ["s5", "s6", "FIN", "CIPH,FIN"], ["s5", "s12", "APP", "TO"], ["s5", "s1", "AL_W", "AL_W"], ["s5", "s1", "AL_F", "TO"], ["s6", "s6", "HELLO", "NO_RENEGO"], ["s6", "s6", "KEX", "TO"], ["s6", "s1", "CIPH", "INT_ERR"], ["s6", "s6", "FIN", "TO"], ["s6", "s11", "APP", "APP"], ["s6", "s1", "AL_W", "AL_W"], ["s6", "s1", "AL_F", "TO"], ["s7", "s7", "HELLO", "TO"], ["s7", "s7", "KEX", "TO"], ["s7", "s1", "CIPH", "TO"], ["s7", "s7", "FIN", "TO"], ["s7", "s7", "APP", "TO"], ["s7", "s2", "AL_W", "AL_W"], ["s7", "s2", "AL_F", "TO"], ["s8", "s8", "HELLO", "TO"], ["s8", "s9", "KEX", "TO"], ["s8", "s10", "CIPH", "TO"], ["s8", "s9", "FIN", "TO"], ["s8", "s8", "APP", "TO"], ["s8", "s2", "AL_W", "AL_W"], ["s8", "s2", "AL_F", "TO"], ["s9", "s9", "HELLO", "TO"], ["s9", "s9", "KEX", "TO"], ["s9", "s1", "CIPH", "HANDSHAKE_FAIL"], ["s9", "s9", "FIN", "TO"], ["s9", "s9", "APP", "TO"], ["s9", "s2", "AL_W", "AL_W"], ["s9", "s2", "AL_F", "TO"], ["s10", "s1", "HELLO", "INT_ERR"], ["s10", "s10", "KEX", "TO"], ["s10", "s1", "CIPH", "INT_ERR"], ["s10", "s10", "FIN", "TO"], ["s10", "s10", "APP", "TO"], ["s10", "s1", "AL_W", "AL_W"], ["s10", "s1", "AL_F", "TO"], ["s11", "s11", "HELLO", "NO_RENEGO"], ["s11", "s11", "KEX", "TO"], ["s11", "s1", "CIPH", "TO"], ["s11", "s11", "FIN", "TO"], ["s11", "s11", "APP", "APP"], ["s11", "s1", "AL_W", "AL_W"], ["s11", "s1", "AL_F", "TO"], ["s12", "s1", "HELLO", "INT_ERR"], ["s12", "s1", "KEX", "INT_ERR"], ["s12", "s1", "CIPH", "INT_ERR"], ["s12", "s11", "FIN", "CIPH,FIN,APP"], ["s12", "s12", "APP", "TO"], ["s12", "s1", "AL_W", "AL_W"], ["s12", "s1", "AL_F", "TO"]];
+
+const states2 = ["s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", "s8", "s9", "s10", "s11", "s12", "s13", "s14", "s15"];
+const transitions2 = [["s0", "s2", "HELLO", "HELLO_VERIFY_REQUEST"], ["s0", "s0", "KEX", "TO"], ["s0", "s1", "CIPH", "TO"], ["s0", "s0", "FIN", "TO"], ["s0", "s0", "APP", "TO"], ["s0", "s0", "AL_W", "TO"], ["s0", "s0", "AL_F", "TO"], ["s1", "s1", "HELLO", "TO"], ["s1", "s1", "KEX", "TO"], ["s1", "s1", "CIPH", "TO"], ["s1", "s1", "FIN", "TO"], ["s1", "s1", "APP", "TO"], ["s1", "s1", "AL_W", "TO"], ["s1", "s1", "AL_F", "TO"], ["s2", "s3", "HELLO", "SER_HELLO_DONE"], ["s2", "s2", "KEX", "TO"], ["s2", "s1", "CIPH", "TO"], ["s2", "s2", "FIN", "TO"], ["s2", "s2", "APP", "TO"], ["s2", "s2", "AL_W", "TO"], ["s2", "s2", "AL_F", "TO"], ["s3", "s3", "HELLO", "SER_HELLO_DONE"], ["s3", "s4", "KEX", "TO"], ["s3", "s1", "CIPH", "TO"], ["s3", "s2", "FIN", "INT_ERR"], ["s3", "s3", "APP", "TO"], ["s3", "s2", "AL_W", "AL_W"], ["s3", "s2", "AL_F", "TO"], ["s4", "s8", "HELLO", "SER_HELLO_DONE"], ["s4", "s2", "KEX", "INT_ERR"], ["s4", "s6", "CIPH", "TO"], ["s4", "s12", "FIN", "CIPH,FIN"], ["s4", "s5", "APP", "TO"], ["s4", "s2", "AL_W", "AL_W"], ["s4", "s2", "AL_F", "TO"], ["s5", "s14", "HELLO", "SER_HELLO_DONE"], ["s5", "s2", "KEX", "INT_ERR"], ["s5", "s6", "CIPH", "TO"], ["s5", "s9", "FIN", "CIPH,FIN,APP"], ["s5", "s5", "APP", "TO"], ["s5", "s2", "AL_W", "AL_W"], ["s5", "s2", "AL_F", "TO"], ["s6", "s1", "HELLO", "INT_ERR"], ["s6", "s1", "KEX", "INT_ERR"], ["s6", "s6", "CIPH", "TO"], ["s6", "s7", "FIN", "CIPH,FIN"], ["s6", "s13", "APP", "TO"], ["s6", "s1", "AL_W", "AL_W"], ["s6", "s1", "AL_F", "TO"], ["s7", "s7", "HELLO", "NO_RENEGO"], ["s7", "s7", "KEX", "TO"], ["s7", "s1", "CIPH", "CIPH,FIN"], ["s7", "s7", "FIN", "TO"], ["s7", "s10", "APP", "APP"], ["s7", "s1", "AL_W", "AL_W"], ["s7", "s1", "AL_F", "TO"], ["s8", "s8", "HELLO", "SER_HELLO_DONE"], ["s8", "s4", "KEX", "TO"], ["s8", "s11", "CIPH", "TO"], ["s8", "s2", "FIN", "INT_ERR"], ["s8", "s14", "APP", "TO"], ["s8", "s2", "AL_W", "AL_W"], ["s8", "s2", "AL_F", "TO"], ["s9", "s9", "HELLO", "TO"], ["s9", "s9", "KEX", "TO"], ["s9", "s1", "CIPH", "TO"], ["s9", "s9", "FIN", "TO"], ["s9", "s9", "APP", "APP"], ["s9", "s2", "AL_W", "AL_W"], ["s9", "s2", "AL_F", "TO"], ["s10", "s10", "HELLO", "NO_RENEGO"], ["s10", "s10", "KEX", "TO"], ["s10", "s1", "CIPH", "TO"], ["s10", "s10", "FIN", "TO"], ["s10", "s10", "APP", "APP"], ["s10", "s1", "AL_W", "AL_W"], ["s10", "s1", "AL_F", "TO"], ["s11", "s1", "HELLO", "INT_ERR"], ["s11", "s6", "KEX", "TO"], ["s11", "s11", "CIPH", "TO"], ["s11", "s1", "FIN", "INT_ERR"], ["s11", "s15", "APP", "TO"], ["s11", "s1", "AL_W", "AL_W"], ["s11", "s1", "AL_F", "TO"], ["s12", "s12", "HELLO", "TO"], ["s12", "s12", "KEX", "TO"], ["s12", "s1", "CIPH", "CIPH,FIN"], ["s12", "s12", "FIN", "TO"], ["s12", "s9", "APP", "APP"], ["s12", "s2", "AL_W", "AL_W"], ["s12", "s2", "AL_F", "TO"], ["s13", "s1", "HELLO", "INT_ERR"], ["s13", "s1", "KEX", "INT_ERR"], ["s13", "s6", "CIPH", "TO"], ["s13", "s10", "FIN", "CIPH,FIN,APP"], ["s13", "s13", "APP", "TO"], ["s13", "s1", "AL_W", "AL_W"], ["s13", "s1", "AL_F", "TO"], ["s14", "s14", "HELLO", "SER_HELLO_DONE"], ["s14", "s5", "KEX", "TO"], ["s14", "s11", "CIPH", "TO"], ["s14", "s2", "FIN", "INT_ERR"], ["s14", "s14", "APP", "TO"], ["s14", "s2", "AL_W", "AL_W"], ["s14", "s2", "AL_F", "TO"], ["s15", "s1", "HELLO", "INT_ERR"], ["s15", "s13", "KEX", "TO"], ["s15", "s11", "CIPH", "TO"], ["s15", "s1", "FIN", "INT_ERR"], ["s15", "s15", "APP", "TO"], ["s15", "s1", "AL_W", "AL_W"], ["s15", "s1", "AL_F", "TO"]];
+
+// We zetten ze om in een meer functionele data structuur, zodat we voor elke
+// state en input de transitie kunnen opvragen. De prefix gebruik ik zodat de
+// states van elk model een andere naam heeft.
+function toModel(alphabet, states, transitions, prefix) {
+  // Ik gebruik een object als Map data structuur. Geen idee of dit normaal is
+  // in javascript, maar het werkt. Ik geloof dat de keys altijd worden omgezet
+  // naar een string. Dat is prima hier.
+  const transitionMap = {}
+  transitions.forEach(([s, t, i, o]) => {
+    transitionMap[[prefix + s, i]] = [o, prefix + t];
+  });
+
+  function behaviour(state, input) {
+    return transitionMap[[state, input]];
+  }
+
+  // We voegen nog een aantal dingen toe aan de functie. Dat kan gewoon in
+  // javascript!
+  behaviour.alphabet = alphabet;
+  behaviour.states = states.map(s => prefix + s);
+  behaviour.initial_state = prefix + states[0];
+  behaviour.id = prefix;
+
+  return behaviour;
+}
+
+// Hier zijn dan uiteindelijk de modellen, hernoemd met m1 en m2.
+const model1 = toModel(alphabet, states1, transitions1, "m1");
+const model2 = toModel(alphabet, states2, transitions2, "m2");
+
+// Met de hand uitgerekend. Momenteel krijgen deze nodes een sterke
+// aantrekkingskracht, maar dat werkt eigenlijk niet zo lekker. Dus ik denk
+// dat het beter is zulke nodes echt te mergen. (Of de "forceManyBodies" te
+// verfijnen.)
+const exact_bisimulation = [{source: "m1s1", target: "m2s1"}, {source: "m1s10", target: "m2s10"}];
+
+// BFS vanuit de begintoestanden. De zoek stops als er een fout wordt gevonden.
+const approx_bisim = (() => {
+  const queue = [[model1.initial_state, model2.initial_state]];
+  const matched = []
+  const visited = new Set();
+
+  while(queue.length > 0) {
+    const [s1, s2] = queue[0];
+    queue.shift(0);
+
+    if (visited.has(s1) || visited.has(s2)) {
+      continue;
+    }
+
+    visited.add(s1);
+    visited.add(s2);
+    matched.push({source: s1, target: s2});
+
+    alphabet.forEach(i => {
+      const [o1, t1] = model1(s1, i);
+      const [o2, t2] = model2 (s2, i);
+
+      if (o1 == o2) {
+        queue.push([t1, t2]);
+      }
+    })
+  }
+
+  return matched;
+})();
+
+// We doen net alsof dit een bisimulation is
+const bisimulation = exact_bisimulation.concat(approx_bisim);
+
+// Punten die gematched zijn, behandelen we anders, dus we willen weten welke
+// dat zijn.
+const matched = new Set();
+bisimulation.forEach(l => {
+  matched.add(l.source);
+  matched.add(l.target);
+});
+
+// Hier gaan we de graaf maken, we zetten gewoon alles in 1 graaf en doen
+// niks ingewikkelds.
+const data = (() => {
+  const models = [model1, model2];
+
+  const nodes = [];
+  const links = [];
+  const linksAdded = new Set();
+
+  models.forEach(m => {
+    m.states.forEach(s => {
+      nodes.push({id: s, model_id: m.id});
+      m.alphabet.forEach(i => {
+        const [o, t] = m(s, i);
+        if (s != t && !linksAdded.has([s, t].toString()) && !linksAdded.has([t, s].toString())) {
+          links.push({source: s, target: t, model_id: m.id});
+          linksAdded.add([s, t].toString());
+        }
+      })
+    })
+  })
+
+  console.log(links);
+
+  return {nodes, links};
+})();
+
+const chart = (() => {
+  const width = 700;
+  const height = 700;
+  const heightMargin = 300;
+
+  const links = data.links.map(d => Object.create(d));
+  const links_bisim = bisimulation.map(d => Object.create(d));
+  const nodes = data.nodes.map(d => Object.create(d));
+
+  // begin en "eind"-toestand van model 1
+  nodes[0].fy = -heightMargin;
+  nodes[1].fy = heightMargin;
+
+  // begin en "eind"-toestand van model 1
+  nodes[13].fy = -heightMargin;
+  nodes[14].fy = heightMargin;
+
+  function extraForces () {
+    var nodes = null;
+
+    function force(alpha){
+      for (let i = 0, n = nodes.length; i < n; ++i) {
+        var node = nodes[i];
+        // we zorgen dat nodes niet boven en onder verdwijnen
+        if (node.y > heightMargin) {
+          node.vy -= alpha * (node.y - heightMargin)
+        }
+        if (node.y < -heightMargin) {
+          node.vy -= alpha * (node.y + heightMargin)
+        }
+        // En ik wil het ene model links en het ander model rechts. We slaan
+        // nodes over die gematched zijn.
+        if (!matched.has(node.id)){
+          if (node.model_id == "m1") {
+            node.vx += 5 * alpha;
+          } else {
+            node.vx -= 5 * alpha;
+          }
+        }
+        // Voor state s2 een extra foce die m wat omhoog duwt. Dit is
+        // natuurlijk een hack.
+        if (node.id == "m1s2" || node.id == "m2s2") {
+          node.vy -= 40 * alpha;
+        }
+      }
+    }
+
+    force.initialize = function(_) { nodes = _; };
+
+    return force;
+  }
+
+  const simulation = d3.forceSimulation(nodes)
+    // Er is een kracht die alle nodes uit elkaar duwt.
+    .force("charge", d3.forceManyBody().distanceMin(8))
+    // Er is een kracht die edges kort houdt (vaste afstand, niet zo handig)
+    .force("link", d3.forceLink(links).id(d => d.id).strength(0.2).distance(150))
+    // Vergelijkbare nodes hebben afstand 0
+    .force("link_bisim", d3.forceLink(links_bisim).id(d => d.id).strength(2).distance(0).iterations(3))
+    // En ik heb nog wat extra dingen toegevoegd
+    .force("extra", extraForces());
+
+  // SVG container
+  const svg = d3.create("svg")
+    .attr("width", width)
+    .attr("height", height)
+    .attr("viewBox", [-width / 2, -height / 2, width, height])
+    .attr("style", "max-width: 100%; height: auto;");
+
+  // een groep voor alle lijnen
+  const link = svg.append("g")
+    .selectAll("line")
+    .data(links)
+    .join("line")
+    .attr("stroke-width", 3);
+
+  // een groep voor alle punten
+  const node = svg.append("g")
+    .attr("style", "isolation: isolate;")
+    .attr("stroke", "#fff")
+    .selectAll("circle")
+    .data(nodes)
+    .join("circle")
+    .attr("style", "mix-blend-mode: multiply")
+    .attr("r", 10);
+
+  // Elke tick moeten we de posities updaten van punten en lijnen
+  simulation.on("tick", () => {
+    link.attr("x1", d => d.source.x)
+      .attr("y1", d => d.source.y)
+      .attr("x2", d => d.target.x)
+      .attr("y2", d => d.target.y)
+      .attr("stroke", d => d.model_id == "m1" ? "#0aa4" : "#aa04");
+
+    node.attr("cx", d => d.x)
+      .attr("cy", d => d.y)
+      .attr("fill", d => d.model_id == "m1" ? "#0ee" : "#ee0")
+      .attr("stroke", d => d.fy == null ? "#fff" : "#000");
+  });
+
+  // Interactie moet de punten
+  const drag = d3.drag()
+    .on("start", dragstarted)
+    .on("drag", dragged)
+    .on("end", dragended);
+
+  node.call(drag).on("click", clickn);
+
+  function dragstarted(event) {
+    if (!event.active) simulation.alphaTarget(0.3).restart();
+    event.subject.fx = event.subject.x;
+    event.subject.fy = event.subject.y;
+  }
+
+  function dragged(event) {
+    event.subject.fx = event.x;
+    event.subject.fy = event.y;
+  }
+
+  function dragended(event) {
+    if (!event.active) simulation.alphaTarget(0);
+  }
+
+  function clickn(event, d) {
+    delete d.fx;
+    delete d.fy;
+    simulation.restart();
+  }
+
+  // Deze dingen hebben we buiten de block scope nog nodig.
+  return {
+    node: svg.node(),
+    simulation: simulation,
+    links: links,
+  };
+})();
+
+// In de html zetten
+container.append(chart.node);
+
+// Slider laten werken.
+var slider = document.getElementById("distance");
+
+// on-input is zolang je aan het slepen bent
+slider.oninput = function() {
+  chart.simulation.force("link", d3.forceLink(chart.links).strength(0.2).distance(this.value));
+  chart.simulation.alphaTarget(0.3).restart();
+}
+
+// on-change is daarna
+slider.onchange = function() {
+  chart.simulation.alphaTarget(0);
+}
+
+</script>
+</body>
diff --git a/index.html b/index.html
index c4fabff..6eb4c06 100644
--- a/index.html
+++ b/index.html
@@ -16,10 +16,11 @@ body {text-align: center; font-family: sans-serif; background: #faf;}
 <li><a href="./123bicategorie/">123bicategorie.nl: webshop for categorical products</a>
 <li><a href="./rust-wasm/">Rust animation in the browser</a>
 <li><a href="./boole/">Boolean operations in svg animation</a>
+<li><a href="./fsm-diff-vis/">Visualisation of differences in two FSM models (demo)</a>
 </ul>
 
 <footer style="color: #ffa">
-Copyright Joshua Moerman 2020 - 2021
+Copyright Joshua Moerman 2020 - 2024
 </footer>
 
 </body>