Def		WellFnd{i}(A;x,y.R(x;y))	[wellfounded]
Def		P  Q	[iff]	core
Def		P  Q	[rev_implies]	core
Def		{T}	[guard]	core
Def		P  Q	[implies]	core
Def		Prop	[prop]	core
Def		x:A. B(x)	[all]	core

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