b1fc8b8e ​

input = #0
output = fill 5v (fill 5h black) |> fold (fold rect) #1
(OList OList Color, OList UList ((VInt, HInt, VInt, HInt), Color))
([[black, black, black, teal, black, black], [black, black, teal, teal, teal, black], [black, teal, black, teal, teal, black], [teal, teal, teal, black, black, black], [black, teal, teal, black, black, black], [black, black, black, black, black, black]], [{((1v, 1h, 2v, 2h), teal)}, {((5v, 4h, 5v, 5h), teal), ((4v, 5h, 5v, 5h), teal), ((5v, 1h, 5v, 2h), teal), ((4v, 2h, 5v, 2h), teal), ((2v, 4h, 2v, 5h), teal), ((1v, 5h, 2v, 5h), teal), ((1v, 1h, 1v, 1h), black)}])
([[teal, teal, teal, teal, black, black], [teal, teal, teal, teal, teal, teal], [black, teal, teal, black, teal, teal], [black, teal, teal, black, black, black], [black, black, black, black, black, black], [black, black, black, black, black, black]], [{((4v, 4h, 5v, 5h), teal), ((4v, 1h, 5v, 2h), teal), ((1v, 4h, 2v, 5h), teal), ((1v, 1h, 2v, 2h), teal)}])
([[black, black, black, teal, black, black], [black, teal, teal, teal, teal, black], [teal, teal, teal, teal, teal, black], [black, teal, teal, black, black, black], [black, black, black, black, black, black], [black, black, black, black, black, black]], [{((1v, 1h, 2v, 2h), teal)}, {((5v, 4h, 5v, 5h), teal), ((4v, 5h, 5v, 5h), teal), ((5v, 1h, 5v, 2h), teal), ((4v, 2h, 5v, 2h), teal), ((2v, 4h, 2v, 5h), teal), ((1v, 5h, 2v, 5h), teal), ((1v, 1h, 1v, 1h), black)}])
([[black, black, teal, teal, black, black], [teal, teal, teal, teal, black, black], [teal, teal, teal, teal, teal, teal], [black, black, teal, teal, teal, teal], [black, black, black, black, black, black], [black, black, black, black, black, black]], [{((4v, 4h, 5v, 5h), teal), ((4v, 1h, 5v, 2h), teal), ((1v, 4h, 2v, 5h), teal), ((1v, 1h, 2v, 2h), teal)}])
([[black, black, black, teal, black, black], [black, teal, teal, teal, black, black], [teal, teal, teal, black, teal, black], [black, teal, teal, teal, teal, black], [black, black, black, black, black, black], [black, black, black, black, black, black]], [{((1v, 1h, 2v, 2h), teal)}, {((5v, 4h, 5v, 5h), teal), ((4v, 5h, 5v, 5h), teal), ((5v, 1h, 5v, 2h), teal), ((4v, 2h, 5v, 2h), teal), ((2v, 4h, 2v, 5h), teal), ((1v, 5h, 2v, 5h), teal), ((1v, 1h, 1v, 1h), black)}])
([[black, black, teal, teal, black, black], [teal, teal, teal, teal, black, black], [teal, teal, black, teal, teal, black], [black, teal, teal, teal, teal, black], [black, teal, teal, black, black, black], [black, black, black, black, black, black]], ?)
([[black, teal, black, teal, black, black], [teal, teal, teal, teal, teal, black], [black, black, black, teal, teal, teal], [black, black, black, black, teal, teal], [black, black, black, black, black, black], [black, black, black, black, black, black]], ?)