/*Source*/ import Lsystem; size(10cm,0); string[][] rules=new string[][]{{"F",""},{"X","-FX++FY-"},{"Y","+FX--FY+"}}; Lsystem dragon=Lsystem("X",rules, La=45, Lai=0); dragon.iterate(12); draw(dragon.paths(), white); shipout(bbox(3mm, Fill(black)));