this.xpos = x;
this.ypos = y;
this.angle = a;
this.length = l;
this.clear();
this.str = this.rewrite(this.depth);
this.moveTo(this.x_offset, this.y_offset);
this.interpret(this.str);
Axiom: FX
X -> X+YF+
Y -> -FX-Y
Iterations: 10
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