9c1e755f ​

input = fill 10v (fill 10h black) |> fold (fold rect) #0
output = fill 10v (fill 10h black) |> fold (fold rect) #1
(OList UList ((VInt, HInt, VInt, HInt), Color), OList UList ((VInt, HInt, VInt, HInt), Color))
([{((6v, 7h, 6v, 9h), brown), ((6v, 4h, 6v, 6h), fuschia), ((3v, 3h, 6v, 3h), grey)}], [{((3v, 7h, 6v, 9h), brown), ((3v, 4h, 6v, 6h), fuschia), ((3v, 3h, 6v, 3h), grey)}])
([{((9v, 2h, 9v, 5h), orange)}, {((8v, 3h, 9v, 4h), green)}, {((2v, 1h, 9v, 1h), grey), ((9v, 6h, 9v, 7h), green), ((8v, 5h, 8v, 7h), yellow), ((8v, 2h, 8v, 2h), yellow)}], [{((7v, 2h, 9v, 5h), orange), ((3v, 4h, 5v, 5h), orange)}, {((2v, 3h, 9v, 4h), green), ((2v, 5h, 8v, 7h), yellow), ((2v, 2h, 8v, 2h), yellow)}, {((2v, 1h, 9v, 1h), grey), ((9v, 6h, 9v, 7h), green), ((7v, 6h, 7v, 7h), green), ((5v, 6h, 5v, 7h), green), ((5v, 2h, 5v, 2h), orange), ((3v, 6h, 3v, 7h), green), ((3v, 2h, 3v, 2h), orange)}])
([{((3v, 2h, 5v, 2h), red)}, {((7v, 2h, 8v, 2h), blue), ((6v, 2h, 6v, 2h), fuschia), ((4v, 2h, 4v, 2h), blue), ((2v, 2h, 2v, 7h), grey)}], [{((3v, 2h, 5v, 7h), red)}, {((7v, 2h, 8v, 7h), blue), ((6v, 2h, 6v, 7h), fuschia), ((4v, 2h, 4v, 7h), blue), ((2v, 2h, 2v, 7h), grey)}])
([{((8v, 2h, 8v, 4h), fuschia), ((2v, 7h, 5v, 7h), green)}, {((2v, 1h, 9v, 1h), grey), ((1v, 7h, 1v, 10h), grey), ((9v, 2h, 9v, 5h), red), ((8v, 5h, 8v, 5h), green), ((8v, 3h, 8v, 3h), green), ((6v, 7h, 7v, 7h), orange), ((4v, 7h, 4v, 7h), orange)}], [{((3v, 2h, 9v, 5h), red)}, {((2v, 5h, 8v, 5h), green), ((2v, 2h, 8v, 4h), fuschia)}, {((2v, 7h, 5v, 10h), green), ((2v, 3h, 8v, 3h), green)}, {((6v, 7h, 7v, 10h), orange), ((4v, 7h, 4v, 10h), orange), ((2v, 1h, 9v, 1h), grey), ((1v, 7h, 1v, 10h), grey)}])
([{((8v, 8h, 8v, 10h), teal)}, {((9v, 8h, 9v, 10h), green), ((7v, 1h, 7v, 1h), blue), ((4v, 1h, 6v, 1h), red), ((3v, 1h, 3v, 1h), yellow), ((2v, 1h, 2v, 5h), grey), ((8v, 9h, 8v, 9h), fuschia), ((2v, 7h, 9v, 7h), grey)}], ?)