# note: Back-reference with plane code 1, which means "the pixel directly
#   above".
# expect: ok
# exercises: kCodeToPlane[0] is 0x18: yoffset 1, xoffset 0, so the distance
#   is a whole row rather than a small number.
lossless
width 8
height 2
code green complex
pixels 0x33 x8 copy 8 1