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method M() { N(); if (*) { } else { assert (forall b: bool :: b || !b) || 0 != 0; } N(); assert (forall b: bool :: b || !b) || 3 != 3; if (*) { } else { assert (exists b: bool :: b || !b) || 4 != 4; } assert (exists b: bool :: b || !b) || 5 != 5; } method N() ensures (forall b: bool :: b || !b) || 2 != 2;