7d1f7ee8 ​

input = fill #0 (fill #1 black) |> fold (fold rect) #2
output = fill #0 (fill #1 black) |> fold (fold rect) #3
(VInt, HInt, OList UList ((VInt, HInt, VInt, HInt), Color), OList UList ((VInt, HInt, VInt, HInt), Color))
(23v, 27h, [{((2v, 2h, 12v, 15h), teal)}, {((6v, 19h, 21v, 27h), orange), ((3v, 3h, 11v, 14h), black)}, {((7v, 20h, 20v, 26h), black), ((4v, 4h, 9v, 9h), yellow)}, {((15v, 4h, 21v, 14h), yellow), ((9v, 21h, 18v, 25h), blue), ((6v, 11h, 10v, 13h), red), ((5v, 5h, 8v, 8h), black)}, {((16v, 5h, 20v, 13h), black), ((10v, 22h, 17v, 24h), black), ((7v, 12h, 9v, 12h), black), ((6v, 6h, 6v, 7h), green)}], [{((2v, 2h, 12v, 15h), teal)}, {((6v, 19h, 21v, 27h), orange), ((3v, 3h, 11v, 14h), black)}, {((7v, 20h, 20v, 26h), black), ((4v, 4h, 9v, 9h), teal)}, {((15v, 4h, 21v, 14h), yellow), ((9v, 21h, 18v, 25h), orange), ((6v, 11h, 10v, 13h), teal), ((5v, 5h, 8v, 8h), black)}, {((16v, 5h, 20v, 13h), black), ((10v, 22h, 17v, 24h), black), ((7v, 12h, 9v, 12h), black), ((6v, 6h, 6v, 7h), teal)}])
(22v, 28h, [{((4v, 2h, 19v, 20h), red)}, {((5v, 3h, 18v, 19h), black)}, {((6v, 4h, 16v, 16h), yellow)}, {((2v, 22h, 12v, 27h), blue), ((7v, 5h, 15v, 15h), black)}, {((16v, 23h, 20v, 27h), green), ((6v, 23h, 9v, 26h), fuschia), ((9v, 8h, 14v, 14h), blue)}, {((17v, 24h, 19v, 26h), black), ((10v, 23h, 11v, 26h), black), ((3v, 23h, 5v, 26h), black), ((7v, 24h, 8v, 25h), black), ((10v, 9h, 13v, 13h), black)}], [{((4v, 2h, 19v, 20h), red)}, {((5v, 3h, 18v, 19h), black)}, {((6v, 4h, 16v, 16h), red)}, {((7v, 5h, 15v, 15h), black)}, {((16v, 23h, 20v, 27h), green), ((2v, 22h, 12v, 27h), blue), ((9v, 8h, 14v, 14h), red)}, {((17v, 24h, 19v, 26h), black), ((10v, 23h, 11v, 26h), black), ((7v, 24h, 8v, 25h), black), ((3v, 23h, 5v, 26h), black), ((10v, 9h, 13v, 13h), black)}])
(12v, 18h, [{((2v, 3h, 11v, 17h), blue)}, {((3v, 4h, 10v, 16h), black)}, {((4v, 5h, 9v, 12h), red)}, {((5v, 6h, 8v, 11h), black)}, {((4v, 14h, 5v, 15h), green), ((6v, 7h, 7v, 8h), teal)}], [{((2v, 3h, 11v, 17h), blue)}, {((3v, 4h, 10v, 16h), black)}, {((4v, 5h, 9v, 12h), blue)}, {((5v, 6h, 8v, 11h), black)}, {((4v, 14h, 5v, 15h), blue), ((6v, 7h, 7v, 8h), blue)}])
(29v, 28h, [{((2v, 3h, 16v, 23h), yellow)}, {((3v, 4h, 15v, 22h), black)}, {((19v, 3h, 28v, 15h), blue), ((4v, 6h, 14v, 21h), green)}, {((19v, 17h, 25v, 25h), teal), ((20v, 4h, 27v, 14h), black), ((5v, 7h, 13v, 20h), black)}, {((20v, 18h, 24v, 24h), black), ((21v, 5h, 26v, 12h), green), ((6v, 11h, 12v, 19h), teal)}, {((21v, 20h, 23v, 22h), yellow), ((22v, 6h, 25v, 11h), black), ((7v, 12h, 11v, 18h), black)}, {((12v, 26h, 13v, 26h), fuschia), ((22v, 21h, 22v, 21h), black), ((23v, 9h, 24v, 10h), red), ((8v, 13h, 9v, 14h), blue)}], ?)