What is the appropriate systematic name of each compound?

(i): 2,3-dimethylhex-3-ene
(ii): 2-methylcyclopent-1-ene
(iii): 3-ethyl-4-methylcyclohex-1-ene

(i): 4,5-dimethylhex-4-ene
(ii): 3-methylcyclopent-1-ene
(iii): 2-ethyl-3-methylcyclohexene

(i): 2,3-dimethylhex-2-ene
(ii): 3-methylcyclopent-1-ene
(iii): 3-ethyl-4-methylcyclohex-1-ene

(i): 4,5-dimethylhex-4-ene
(ii): 2-methylcyclopentene
(iii): 2-ethyl-3-methylcyclohexene