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It would be good to have a reference to a parsing tool that had better support for prefix operators.  For example, how do you parse an expression like this:  ∃x. ∃y. x=y

    *** Exception: (line 1, column 5):
    unexpected "∃"
    expecting "(", expression, identifier, "nil", integer, "<", "|--", "true" or "false"

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