23581191 ​

let p1: (Int, Int)
let p2: (Int, Int)

let input = fill 9 (fill 9 black)
  |> point p1 teal
  |> point p2 orange

let output = fill 9 (fill 9 black)
  |> vline (1, -1, p1.2, teal)
  |> hline (p1.1, 1, -1, teal)
  |> vline (1, -1, p2.2, orange)
  |> hline (p2.1, 1, -1, orange)
  |> point (p1.1, p2.2) red
  |> point (p2.1, p1.2) red