3e980e27 ​

input = fill 13v (fill 13h black) |> fold (fold rect) #0
output = fill 13v (fill 13h black) |> fold (fold rect) #1
(OList UList ((VInt, HInt, VInt, HInt), Color), OList UList ((VInt, HInt, VInt, HInt), Color))
([{((4v, 4h, 5v, 5h), blue)}, {((9v, 8h, 9v, 8h), red), ((6v, 6h, 6v, 6h), blue), ((4v, 4h, 4v, 4h), red)}], [{((9v, 7h, 10v, 8h), blue), ((4v, 4h, 5v, 5h), blue)}, {((11v, 6h, 11v, 6h), blue), ((9v, 8h, 9v, 8h), red), ((6v, 6h, 6v, 6h), blue), ((4v, 4h, 4v, 4h), red)}])
([{((3v, 6h, 4v, 7h), yellow)}, {((10v, 10h, 10v, 10h), green), ((7v, 3h, 7v, 3h), green), ((3v, 8h, 3v, 8h), yellow), ((2v, 7h, 2v, 7h), yellow), ((3v, 7h, 3v, 7h), green)}], [{((10v, 9h, 11v, 10h), yellow), ((7v, 2h, 8v, 3h), yellow), ((3v, 6h, 4v, 7h), yellow)}, {((10v, 11h, 10v, 11h), yellow), ((9v, 10h, 9v, 10h), yellow), ((7v, 4h, 7v, 4h), yellow), ((6v, 3h, 6v, 3h), yellow), ((3v, 8h, 3v, 8h), yellow), ((2v, 7h, 2v, 7h), yellow), ((10v, 10h, 10v, 10h), green), ((7v, 3h, 7v, 3h), green), ((3v, 7h, 3v, 7h), green)}])
([{((9v, 8h, 9v, 9h), yellow), ((9v, 2h, 9v, 2h), green), ((8v, 8h, 8v, 8h), red), ((8v, 7h, 8v, 7h), yellow), ((4v, 3h, 4v, 3h), teal), ((3v, 4h, 3v, 5h), teal), ((3v, 3h, 3v, 3h), green), ((2v, 11h, 2v, 11h), red)}], [{((10v, 2h, 10v, 2h), teal), ((9v, 8h, 9v, 9h), yellow), ((9v, 3h, 9v, 4h), teal), ((9v, 2h, 9v, 2h), green), ((8v, 8h, 8v, 8h), red), ((8v, 7h, 8v, 7h), yellow), ((4v, 3h, 4v, 3h), teal), ((3v, 10h, 3v, 11h), yellow), ((3v, 4h, 3v, 5h), teal), ((3v, 3h, 3v, 3h), green), ((2v, 12h, 2v, 12h), yellow), ((2v, 11h, 2v, 11h), red)}])
([{((8v, 11h, 9v, 12h), blue)}, {((2v, 10h, 4v, 10h), yellow), ((2v, 8h, 2v, 10h), yellow), ((12v, 9h, 12v, 9h), red), ((10v, 5h, 10v, 5h), green), ((9v, 11h, 9v, 11h), green), ((9v, 10h, 9v, 10h), blue), ((3v, 9h, 3v, 9h), red), ((3v, 4h, 3v, 4h), red)}], [{((11v, 8h, 11v, 10h), yellow), ((11v, 8h, 13v, 8h), yellow), ((2v, 3h, 2v, 5h), yellow), ((2v, 3h, 4v, 3h), yellow), ((9v, 5h, 10v, 6h), blue), ((8v, 11h, 9v, 12h), blue)}, {((2v, 10h, 4v, 10h), yellow), ((2v, 8h, 2v, 10h), yellow), ((12v, 9h, 12v, 9h), red), ((10v, 5h, 10v, 5h), green), ((10v, 4h, 10v, 4h), blue), ((9v, 11h, 9v, 11h), green), ((9v, 10h, 9v, 10h), blue), ((3v, 9h, 3v, 9h), red), ((3v, 4h, 3v, 4h), red)}])
([{((3v, 2h, 4v, 3h), blue)}, {((6v, 11h, 7v, 11h), teal), ((6v, 9h, 6v, 11h), teal), ((11v, 8h, 11v, 8h), green), ((10v, 4h, 10v, 4h), red), ((8v, 10h, 8v, 10h), teal), ((7v, 10h, 7v, 10h), green), ((3v, 3h, 3v, 3h), red), ((2v, 10h, 2v, 10h), red), ((2v, 6h, 2v, 6h), green), ((2v, 3h, 2v, 3h), blue)}], ?)