Nuprl Lemma : no_repeats_wf 11,40

T:Type, l:(T List). no_repeats(Tl prop{i:l} 
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DefinitionsFalse, A  B, A, P  Q, no_repeats(Tl), prop{i:l}, t  T, x:AB(x),
Lemmasselect wf, not wf, length wf1, nat wf

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