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QuickCheck instances (generation of random formulae)
diff : Get a "formula" which represents the differences between two given formulae (equal subexpressions are truncated; so are the subexpressions of subexpressions whose heads already differ)
Tests passed:
For randomly generated formulae, parse . toTPTP == id
For all files in the TPTP (v 5.2.0) distribution's Problems subtree which don't match the regex "^(thf|tff)(", parse . toTPTP . parse == parse
Not yet implemented: The new thf and tff formula types.