Some definitions of interest.
iff	Def P  Q == (P  Q) & (P  Q)
	Thm* A,B:Prop. (A  B)  Prop
refl	Def Refl(T;x,y.E(x;y)) == a:T. E(a;a)
	Thm* T:Type, E:(TTProp). Refl(T;x,y.E(x,y))  Prop

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