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Goal driven Parallel Sequences
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Inspired by https://www.cs.cmu.edu/~fp/courses/15816-s12/lectures/01-inference.pdf

[[
In linear logic we are instead concerned with the change of truth with a
change of state. We model this in a very simple way: when an inference rule
is applied we consume the propositions used as premises and produce the
propositions in the conclusions, thereby effecting an overall change in state.
]]

The tests are at http://josd.github.io/eye/reasoning/gps/test
