_diag masks red vs blue 2

fill(2, 2, 2, 6, 6, 6, "blue_wool");
fill(10, 2, 2, 14, 6, 6, "red_wool");
fill(18, 2, 2, 22, 6, 6, "red_wool");
// A: clear one red cube via mask
clearMasked(17, 0, 0, 23, 23, 23, onlyMaterial("red_wool"));
// B: blue -> stone
replaceMasked(0, 0, 0, 23, 23, 23, "stone", onlyMaterial("blue_wool"));
// C: red -> gold
replaceMasked(0, 0, 0, 23, 23, 23, "gold_block", onlyMaterial("red_wool"));
// D: marker column height 5 if any gold survived logic
fill(2, 10, 20, 2, 14, 20, "glowstone");