size 400 400
paper 10
fast
command rect x y s h c
{pen (c+10) (c-10) (c*10)line (x+10) y (x) (y+s)line x (y+s) (x+s) (y+s)line (x+10) (y+s) (x+s) y}forever
{same? 100{
rect 50 20
}
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