| ⊦ ps=(r, st, r1, st1) ∧ ¬ junkref(str, r, st) ∧ ¬ junkref(str, r1, st1) ∧ ¬ cyclic(str, r1, st1) → ¬ cyclic(str, r, st) |
ps=(r, st, r1, st1), cyclic(str, r, st) ⊦ junkref(str, r, st), junkref(str, r1, st1), cyclic(str, r1, st1)
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