python: revision graph

graph

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first half of old /c/Drive_F/merged_d/src/python/distr.py
Wed, 28 Jul 2021 17:54:23 +0100, by Henry S. Thompson
use indentation and colour to differentiate safe from unsafe landing place
Mon, 31 May 2021 15:01:38 +0100, by Henry Thompson
combine from various sources
Sat, 29 May 2021 21:32:41 +0100, by Henry Thompson

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