∃!(x,y)x∈{A,B,C,D,E} ∧ y∈{X,Y,Z}.
	⊢{X,Y,Z}::G(s)
	find S(s)..._::G(s) of known F(s) so that if x∈P does that x = y∈R.
	Form and test hypothesises ϖF()◇→G()∨H()⇝G()::do this; H():: do that...
	Cross check with own G to not do anything stupid...