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233 = 18 combinations.
There are 18C4 = 18!/[18-4)!4!] = 18*17*16*15/(4*3*2*1) = 3060 combinations.
There are 18 permutations or 5 combinations. And it is one die, many dice. There is no such word as dices or diceses.
3 items each in 3 categories gives 3*3*3 = 27 possible combinations.
11*3*3 = 99 combinations.