Extensions 1→N→G→Q→1 with N=C18 and Q=C4

Direct product G=NxQ with N=C18 and Q=C4
dρLabelID
C2xC3672C2xC3672,9

Semidirect products G=N:Q with N=C18 and Q=C4
extensionφ:Q→Aut NdρLabelID
C18:C4 = C2xDic9φ: C4/C2C2 ⊆ Aut C1872C18:C472,7

Non-split extensions G=N.Q with N=C18 and Q=C4
extensionφ:Q→Aut NdρLabelID
C18.C4 = C9:C8φ: C4/C2C2 ⊆ Aut C18722C18.C472,1

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