2c737e39 ​

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))
(12v, 10h, [{((2v, 3h, 2v, 5h), blue)}, {((1v, 4h, 2v, 4h), green), ((8v, 7h, 8v, 7h), grey), ((5v, 5h, 5v, 5h), red), ((5v, 4h, 5v, 4h), orange), ((4v, 4h, 4v, 4h), blue), ((3v, 4h, 3v, 4h), grey), ((3v, 2h, 3v, 3h), yellow)}], [{((2v, 3h, 2v, 5h), blue), ((7v, 6h, 7v, 8h), blue)}, {((1v, 4h, 2v, 4h), green), ((10v, 8h, 10v, 8h), red), ((10v, 7h, 10v, 7h), orange), ((9v, 7h, 9v, 7h), blue), ((8v, 5h, 8v, 6h), yellow), ((6v, 7h, 7v, 7h), green), ((5v, 5h, 5v, 5h), red), ((5v, 4h, 5v, 4h), orange), ((4v, 4h, 4v, 4h), blue), ((3v, 4h, 3v, 4h), grey), ((3v, 2h, 3v, 3h), yellow)}])
(12v, 12h, [{((4v, 3h, 5v, 4h), red)}, {((9v, 8h, 9v, 8h), grey), ((5v, 4h, 5v, 4h), grey), ((3v, 3h, 3v, 4h), green)}], [{((4v, 3h, 5v, 4h), red)}, {((8v, 7h, 8v, 8h), red), ((8v, 7h, 9v, 7h), red), ((7v, 7h, 7v, 8h), green), ((5v, 4h, 5v, 4h), grey), ((3v, 3h, 3v, 4h), green)}])
(9v, 10h, [{((2v, 4h, 2v, 5h), blue), ((1v, 4h, 2v, 4h), blue), ((7v, 3h, 7v, 3h), grey), ((4v, 6h, 4v, 6h), green), ((3v, 5h, 4v, 5h), red), ((3v, 4h, 3v, 4h), grey)}], [{((2v, 4h, 2v, 5h), blue), ((1v, 4h, 2v, 4h), blue), ((6v, 3h, 6v, 4h), blue), ((5v, 3h, 6v, 3h), blue), ((8v, 5h, 8v, 5h), green), ((7v, 4h, 8v, 4h), red), ((4v, 6h, 4v, 6h), green), ((3v, 5h, 4v, 5h), red), ((3v, 4h, 3v, 4h), grey)}])
(11v, 10h, [{((11v, 6h, 11v, 7h), teal), ((11v, 3h, 11v, 3h), black), ((11v, 2h, 11v, 2h), blue), ((10v, 4h, 11v, 5h), green), ((10v, 2h, 10v, 3h), red), ((9v, 4h, 9v, 4h), grey), ((3v, 7h, 3v, 7h), grey)}], ?)