atomic4.in 203 Bytes
# Check that isl is not confused by inconsistent separate and atomic options.
{ sync[] -> [i, 0] : 0 <= i <= 64 }
{ : }
{ [i, 0] -> separate[1] : 1 <= i <= 62; [i, 0] -> atomic[1] : i <= 10 or i >= 20 }