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docs: change `troubles` references to `instability`
Sat, 27 Apr 2019 19:42:42 -0400, by Matt Harbison
docs: change `precursors` references to `predecessors`
Sat, 27 Apr 2019 19:32:03 -0400, by Matt Harbison
docs: import figure diagrams with inkscape 0.92
Sat, 27 Apr 2019 14:42:48 -0400, by Matt Harbison

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