Nuprl Lemma : existse-between1-true 0,22

es:ES, e1:E, e2:{e:E| loc(e) = loc(e1 Id }. e[e1,e2).True  (e1 <loc e2
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Definitionst  T, x:AB(x), (e <loc e'), Prop, True, e[e1,e2).P(e), P  Q, P  Q, b, False, A, loc(e), Id, E, xt(x), P & Q, P  Q, ES, A & B, x:AB(x), e  e' 
Lemmases-le-self, es-le wf, es-le-trans2, event system wf, existse-between1 wf, true wf, es-E wf, Id wf, es-loc wf, es-loc-pred, es-locl wf

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