In reply to the_ceylonese:
By De Morgan’s law, the two lines are complements of each other.
Assuming the cross refers to the coverpoints in the first post with bins a = {[0:27]}, then the first ignore_bins says
Remove all the crosses where the A has one of the values: 0,1,6-27, or B has one of the values 0-2,7-27
and the second ignore_bins says
Remove all the crosses where the A has one of the values 2-7 and B has the value 3-6