L System

https://cdn-ak.f.st-hatena.com/images/fotolife/a/aidiary/20131125/20131125213648.png

https://cdn-ak.f.st-hatena.com/images/fotolife/a/aidiary/20131125/20131125214906.png

http://cdn-ak.f.st-hatena.com/images/fotolife/a/aidiary/20131126/20131126202304.png