﻿version 1.0, 2014-07-02 -- initial release
version 1.1, 2016-12-17 -- fix bug that prevented ssa_flag=forbid from working properly (thanks Yoriz)
version 1.2, 2020-04-10 -- fix bug where unambiguous ssa cases were sometimes improperly flagged as having two solutions (thanks Gordon24771402)
