How many cyclic isomers possible of (C6H12) Hexene?

There is twelve cyclic compounds can draw with molecular formula of (C₆H₁₂ ) hexene. Six – Four member cyclic compounds and six - three member cyclic compounds  
(A) Six – Four member cyclic compounds:

(1) Cyclohexane (2) 1-Methylcyclopentane (3) 1-Ethylcyclobutane (4) 1,1-Dimethylbutane (5) 1,2-Dimethylcyclobutane (6) 1,3-Dimethylcyclobutane

(B) Six - three member cyclic compounds:

(1) 1-Propylcyclopropane (2) 1-(1-methylethyl)cyclopropane (3) 1-Ethyl-1-methylcyclopropane (4) 1-Ehtyl-3-methylcyclopropane (5) 1,1-Dimthyl-2-methylcyclopropane (6) 1,2,3-Trimethylcyclopropane.

How many cyclic isomers possible of (C5H10) pentene?