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:import std/Combinator .
:import std/List .
:import Screen .
t-square-1 [[build tl tr bl br] mut]
mut y* ([[[[build 3 2 1 b]]]] : ([[[[build 3 2 b 0]]]] : ([[[[build 3 b 1 0]]]] : {}[[[[build b 2 1 0]]]])))
tl ^0
tr ^(~0)
bl ^(~(~0))
br ^(~(~(~0)))
t-square-2 [[build tl tr bl br] mut]
mut y* ([[[[build 3 2 1 (build b w w b)]]]] : ([[[[build 3 2 (build w b b w) 0]]]] : ([[[[build 3 (build w b b w) 1 0]]]] : {}[[[[build (build b w w b) 2 1 0]]]])))
tl ^0
tr ^(~0)
bl ^(~(~0))
br ^(~(~(~0)))
sierpinski-carpet [[build tl tr bl br] mut]
mut y* ([[[[build 3 2 1 (build (build b w w w) w w b)]]]] : ([[[[build 3 2 (build w (build w b w w) b w) 0]]]] : ([[[[build 3 (build w b (build w w b w) w) 1 0]]]] : {}[[[[build (build b w w (build w w w b)) 2 1 0]]]])))
tl ^0
tr ^(~0)
bl ^(~(~0))
br ^(~(~(~0)))
sierpinski-triangle [y [build 0 b 0 0]]
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