Data Analysis for Number of Solution to delta = non-unit

N = 5

[C1] non-units	[C2] #non-units lead to same #solution for $discriminant$	[C3] #solution for $discriminant$ = non-units in C1
0	1	5
	C₂^TC₃ = #ways delta can be non-unit	5

Total non-singular EC over Z₅ = 5² - #ways delta can be non-unit (C₂^TC₃) = 20