Parser: relation chaining is guided by the operator group
All infix operations in the weakest priority group (those containing at least one of the characters '=', '<', '>', or '~') are considered non-associative and the chains (t1 OP t2 OP t3) are translated into conjunctions (t1 OP t2 /\ t2 OP t3). This does not concern implication '->' and equivalence '<->' which are right-associative. like the rest of propositional connectives.
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