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angle bisector 180 degree bug fix
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added tutorial
Fix bugged link to level19
Fix bugged link to 20 level
Merge pull request #237 from cono/master

Fix bugged link to level19
Merge pull request #238 from cono/patch-1

Fix bugged link to 20 level
Update Level20.html
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Added a menu for quick navigation
Merge remote-tracking branch 'upstream/master'