Table 3.

Backbone sequences for C4

βXY, 1	β XY, β Y	Z0|X = 0, ZHA|X > 0	Z0|X > 0, ZHA|X = 0	Slope	ϕX = 0, ϕX > 0	ϕX = 0, ξ	Relation	Function
>	*	*	*	+	*	*	ξ > S > ϕX > 0	G+
>	*	<	*	-	*	*	ξ > S > ϕX > 0	G+
>	*	<	*	-	*	*	ξ > ϕX > 0 > S	G+
>	*	<	*	-	*	*	S > ξ > ϕX > 0	G+
∅	>	>	*	*	*	*	ξ > S > ϕX > 0	G+
∅	>	>	*	*	*	*	ξ > ϕX > 0 > S	G+
∅	>	>	*	*	*	*	S > ξ > ϕX > 0	G+
*	<	*	*	*	*	<	ξ > S > ϕX > 0	G+
*	<	*	*	*	*	<	ξ > ϕX > 0 > S	G+
*	<	*	*	*	*	<	S > ξ > ϕX > 0	G+
*	<	*	*	*	>	*	ϕX > 0 > S > ξ	G-
>	*	*	*	+	*	*	ξ > ϕX > 0 > S	P+T+
>	*	*	*	+	*	*	S > ξ > ϕX > 0	P+T+
*	<	*	*	*	>	*	S > ϕX > 0 > ξ	P-T-
*	<	*	*	*	>	*	ϕX > 0 > ξ > S	P-T-
*	<	*	*	*	<	>	ϕX > 0 > S > ξ	Impossible
*	<	*	*	∅	<	>	ϕX > 0 > ξ > S	P-T+
*	<	*	*	∅	<	>	S > ϕX > 0 > ξ	P-T+

All possible backbone sequences for C4 and its relation to the circuit's function.