T:Type, as:T List. (i:||as||. as[i]){||as||} = as 

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Definitions	l[i], {i..j}, f{m..n}, False, A, ij, True, i<j, b, b, , AB, ij, T, P  Q, P & Q, P  Q, Unit, , ||as||, Prop, P  Q, x:A. B(x), t  T
Lemmas	length wf1, nat wf, eqtt to assert, assert of le int, iff transitivity, eqff to assert, squash wf, true wf, bnot of le int, assert of lt int, le int wf, le wf, bool wf, bnot wf, assert wf, lt int wf, non neg length, select cons hd, listify wf, select cons tl, int seg wf, select wf