Nuprl Lemma : l_contains-append4 11,40

T:Type, ABC:(T List). A  C  A  B @ C 
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DefinitionsA  B, xLP(x), xt(x), P  Q, P & Q, P  Q, as @ bs, , P  Q, {T}, (x  l), x:AB(x), P  Q, t  T
Lemmasl member wf, append wf, member append, implies functionality wrt iff, all functionality wrt iff

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