N = 49

[C1] non-units	[C2] #non-units lead to same #solution for	[C3] #solution for = non-units in C1
0	1	91
42, 35, 7, 21, 14, 28	6	42
	C2TC3 = #ways delta can be non-unit	343

Total non-singular EC over Z₄₉ = 49² - #ways delta can be non-unit (C₂^TC₃) = 2058