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3 ships, PP, CP and MP
CP = 18 + PP
MP = 2PP -14
Total staterooms = 492
492 = PP + 18 + PP + 2PP - 14
492 = 4PP + 4
496 = 4PP
PP = 124
CP = 18 + 124 = 142
MP = 2(124) - 14 = 270
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