Extensions 1→N→G→Q→1 with N=C₂ and Q=D₂₁

Direct product G=N×Q with N=C₂ and Q=D₂₁

		d	ρ	Label	ID
D₄₂		42	2+	D42	84,14

Non-split extensions G=N.Q with N=C₂ and Q=D₂₁

extension	φ:Q→Aut N	d	ρ	Label	ID
C₂.D₂₁ = Dic₂₁	central extension (φ=1)	84	2-	C2.D21	84,5

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Extensions 1→N→G→Q→1 with N=C2 and Q=D21