8dae5dfc ​

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))
(18v, 19h, [{((2v, 3h, 14v, 12h), teal)}, {((3v, 14h, 8v, 19h), red), ((3v, 4h, 13v, 11h), orange)}, {((4v, 15h, 7v, 18h), blue), ((5v, 6h, 11v, 9h), yellow)}, {((5v, 16h, 6v, 17h), green), ((6v, 7h, 10v, 8h), green)}], [{((2v, 3h, 14v, 12h), green)}, {((3v, 14h, 8v, 19h), green), ((3v, 4h, 13v, 11h), yellow)}, {((4v, 15h, 7v, 18h), blue), ((5v, 6h, 11v, 9h), orange)}, {((5v, 16h, 6v, 17h), red), ((6v, 7h, 10v, 8h), teal)}])
(18v, 16h, [{((3v, 3h, 14v, 14h), blue)}, {((5v, 5h, 12v, 12h), green)}, {((6v, 6h, 11v, 11h), teal)}, {((8v, 8h, 9v, 9h), red)}], [{((3v, 3h, 14v, 14h), red)}, {((5v, 5h, 12v, 12h), teal)}, {((6v, 6h, 11v, 11h), green)}, {((8v, 8h, 9v, 9h), blue)}])
(17v, 17h, [{((8v, 5h, 17v, 16h), fuschia)}, {((9v, 6h, 16v, 15h), green)}, {((1v, 1h, 6v, 6h), teal), ((10v, 7h, 15v, 14h), yellow)}, {((2v, 2h, 5v, 5h), red), ((11v, 8h, 14v, 13h), red)}, {((3v, 3h, 4v, 4h), blue), ((12v, 9h, 13v, 12h), blue)}], [{((8v, 5h, 17v, 16h), blue)}, {((9v, 6h, 16v, 15h), red)}, {((1v, 1h, 6v, 6h), blue), ((10v, 7h, 15v, 14h), yellow)}, {((2v, 2h, 5v, 5h), red), ((11v, 8h, 14v, 13h), green)}, {((3v, 3h, 4v, 4h), teal), ((12v, 9h, 13v, 12h), fuschia)}])
(17v, 19h, [{((10v, 2h, 17v, 13h), red)}, {((1v, 4h, 7v, 12h), blue), ((11v, 3h, 16v, 12h), yellow)}, {((3v, 6h, 5v, 10h), fuschia), ((12v, 4h, 15v, 11h), blue)}, {((4v, 7h, 4v, 9h), teal), ((13v, 5h, 14v, 10h), teal)}], [{((10v, 2h, 17v, 13h), teal)}, {((1v, 4h, 7v, 12h), teal), ((11v, 3h, 16v, 12h), blue)}, {((3v, 6h, 5v, 10h), fuschia), ((12v, 4h, 15v, 11h), yellow)}, {((4v, 7h, 4v, 9h), blue), ((13v, 5h, 14v, 10h), red)}])
(20v, 19h, [{((12v, 4h, 20v, 16h), fuschia)}, {((13v, 5h, 19v, 15h), teal), ((2v, 2h, 10v, 11h), green)}, {((5v, 14h, 10v, 19h), grey), ((14v, 6h, 18v, 14h), red), ((4v, 4h, 8v, 9h), fuschia)}, {((6v, 15h, 9v, 18h), yellow), ((15v, 7h, 17v, 13h), yellow), ((5v, 5h, 7v, 8h), blue)}, {((7v, 16h, 8v, 17h), teal), ((16v, 8h, 16v, 12h), green), ((6v, 6h, 6v, 7h), yellow)}], ?)