952a094c ​

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