Who Cites array-select?
array-select	Def a[i] == 2of(a)(i)
pi2	Def 2of(t) == t.2
	Thm* A:Type, B:(AType), p:(a:AB(a)). 2of(p) B(1of(p))

Syntax:

a[i]

has structure:

array-select(a; i)

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