group J N 14 classes of subgroups by index: {1: 1} nodes 677422 time 20.8s
group J N 16 classes of subgroups by index: {1: 1} nodes 3002323 time 101.1s
sh: line 1: 77377 Terminated: 15          nice -n 10 python3 lowindex_A.py classes J 18
