You are using six on few places, is that necessary?
fc-solve/scripts/analyse-deals-range-prelude-stage-execution.py:from six import print_
fc-solve/scripts/generate-summary-length-improvements/summarizer-v2.py:from six.moves import range
fc-solve/source/board_gen/find-freecell-deal-index.py:from six.moves import range
You are using six on few places, is that necessary?