diff --git a/index.html b/index.html
index bbc84cc..bb24890 100644
--- a/index.html
+++ b/index.html
@@ -404,7 +404,7 @@ To use in other wikis, drag and drop this link to those wikis: [[Kookma Plugin L
 <div created="20200815145319810" creator="ulaulaman" modified="20200815145609325" modifier="ulaulaman" title="$:/config/SideBar/Visibility/Menu">
 <pre>show</pre>
 </div>
-<div created="20200904194810599" creator="ulaulaman" modified="20201203001810198" modifier="ulaulaman" title="$:/config/Whitespace/search">
+<div created="20200904194810599" creator="ulaulaman" modified="20201216221247283" modifier="ulaulaman" title="$:/config/Whitespace/search">
 <pre>no</pre>
 </div>
 <div created="20200728190149332" creator="ulaulaman" modified="20200728190152217" modifier="ulaulaman" title="$:/config/Whitespace/sidebar">
@@ -11371,10 +11371,10 @@ exports.run = function(tag) {
 <div created="20200728124256197" creator="u" modified="20200728124300028" modifier="ulaulama" title="$:/status/UserName">
 <pre>ulaulaman</pre>
 </div>
-<div created="20201202212134615" creator="ulaulaman" list="[[Gianluigi Filippelli]] EduINAF" modified="20201203001252706" modifier="ulaulaman" title="$:/StoryList">
+<div created="20201216221229050" creator="ulaulaman" list="[[Gianluigi Filippelli]]" modified="20201216221229050" modifier="ulaulaman" title="$:/StoryList">
 <pre></pre>
 </div>
-<div created="20200904194810600" creator="ulaulaman" modified="20201203001810200" modifier="ulaulaman" title="$:/temp/advancedsearch">
+<div created="20200904194810600" creator="ulaulaman" modified="20201216221247284" modifier="ulaulaman" title="$:/temp/advancedsearch">
 <pre></pre>
 </div>
 <div plugin-type="info" title="$:/temp/info-plugin" type="application/json">
@@ -11748,7 +11748,7 @@ For learning plugin features, syntax, tutorial and examples see the plugin demo
 " requires-reload="no" server-url="https://kookma.github.io/TW-PluginLibrary/library/index.html" source="https://github.com/kookma/TW-Utility" tags="$:/tags/RemoteAssetInfo" title="$:/temp/RemoteAssetInfo/https://kookma.github.io/TW-PluginLibrary/library/index.html/$:/plugins/kookma/utility" type="text/vnd.tiddlywiki" version="2.1.2">
 <pre></pre>
 </div>
-<div created="20200904194735260" creator="ulaulaman" modified="20201203001810201" modifier="ulaulaman" title="$:/temp/search">
+<div created="20200904194735260" creator="ulaulaman" modified="20201216221247285" modifier="ulaulaman" title="$:/temp/search">
 <pre></pre>
 </div>
 <div created="20200824104326780" creator="ulaulaman" modified="20200824104326780" modifier="ulaulaman" tags="$:/tags/ServerConnection" title="$:/temp/ServerConnection/https://kookma.github.io/TW-PluginLibrary/library/index.html" url="https://kookma.github.io/TW-PluginLibrary/library/index.html">
@@ -12469,7 +12469,7 @@ In this case I simple call the macro using the code
 as first row in [[twitter.svg]].
 </pre>
 </div>
-<div created="20200803172912753" creator="ulaulaman" modified="20201202212147061" modifier="ulaulaman" tags="tikzdraw" title="Mathematics" type="text/x-markdown">
+<div created="20200803172912753" creator="ulaulaman" modified="20201216221242854" modifier="ulaulaman" tags="tikzdraw" title="Mathematics" type="text/x-markdown">
 <pre>| Title       | Source          | Pdf |
 |:-------------|:------------------|:------|
 | Hutton's formula | [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/math/hutton_formula.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/math/pdf/hutton_formula.pdf)  |
@@ -12477,6 +12477,7 @@ as first row in [[twitter.svg]].
 | Rolling circle squares itself | [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/math/rolling_circle.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/math/pdf/rolling_circle.pdf) |
 | The Witch of Agnesi | [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/math/agnesi_witch.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/math/pdf/agnesi_witch.pdf) |
 | The Butterfly curve | [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/math/butterfly.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/math/pdf/butterfly.pdf) |
+| Ostomachion | [tex source](https://github.com/ulaulaman/tikzdraw/blob/master/math/ostomachion.tex) | [pdf](https://github.com/ulaulaman/tikzdraw/blob/master/math/pdf/ostomachion.pdf) |
 
 ### Math without words