b9b7f026 ​

input = fill #0 (fill #1 black) |> rect #2 |> fold rect #3
output = fill 1v (fill 1h (#2.2))
(VInt, HInt, ((VInt, HInt, VInt, HInt), Color), UList ((VInt, HInt, VInt, HInt), Color))
(15v, 13h, ((2v, 2h, 5v, 4h), fuschia), {((12v, 1h, 13v, 3h), yellow), ((12v, 9h, 14v, 12h), teal), ((8v, 4h, 10v, 8h), red), ((6v, 10h, 8v, 12h), orange), ((4v, 6h, 5v, 7h), blue), ((2v, 9h, 4v, 11h), green), ((3v, 3h, 4v, 3h), black)})
(15v, 17h, ((4v, 8h, 10v, 11h), grey), {((12v, 11h, 15v, 15h), yellow), ((3v, 1h, 5v, 5h), teal), ((1v, 14h, 6v, 17h), orange), ((7v, 4h, 12v, 6h), red), ((7v, 9h, 8v, 10h), black)})
(16v, 17h, ((10v, 3h, 14v, 9h), red), {((10v, 12h, 13v, 16h), orange), ((3v, 11h, 8v, 15h), green), ((2v, 3h, 6v, 8h), blue), ((12v, 4h, 13v, 6h), black)})
(14v, 15h, ((12v, 11h, 14v, 14h), orange), {((2v, 1h, 7v, 8h), red), ((1v, 11h, 5v, 14h), green), ((13v, 12h, 13v, 13h), black), ((10v, 5h, 13v, 8h), teal), ((9v, 2h, 11v, 4h), grey), ((7v, 10h, 10v, 13h), yellow)})