1 | 1. True 2. u: LabelTerm 3. v: (LabelTerm) List 4. subst_mentions_trace(v) (i:||v||. mentions_trace(2of(v[i]))) 5. subst_mentions_trace(v) (i:||v||. mentions_trace(2of(v[i]))) 6. i: (||v||+1) 7. mentions_trace(2of([u / v][i])) mentions_trace(2of(u)) subst_mentions_trace(v) |
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