evolve: revision graph

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obsdiscovery: use plural forms of nodes and markers for variables
Sat, 06 Jun 2020 20:37:10 +0800, by Anton Shestakov
obsdiscovery: assign successors and predecessors to variables
Sat, 06 Jun 2020 20:32:38 +0800, by Anton Shestakov
obsdiscovery: make some variables' names longer
Sat, 06 Jun 2020 19:43:58 +0800, by Anton Shestakov
obsdiscovery: import node as nodemod to free up the name
Sat, 06 Jun 2020 19:32:15 +0800, by Anton Shestakov

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