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Answer:
Set X:(Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sept. Oct. Nov. December.)
Set Y:(September, October, November, December)
Set Z:(January, March, May, July, August, October, December)
Explanation:
Set X has 12 months. (duh)
Set Y always has 4 months ending with "ber" which others call "The -bed months"
Set Z, use the knuckle method. Those that are in the knuckles have 31 days while between the knuckles have 28,29 & 30 days.