Who Cites pre rel?
pre_rel	Def t.rel == 2of(2of(t))
pi2	Def 2of(t) == t.2
	Thm* A:Type, B:(AType), p:(a:AB(a)). 2of(p) B(1of(p))

Syntax:

t.rel

has structure:

pre_rel(t)

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