There are only four combinations but there are 8 permutations.
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Assuming you have three boxes, each of which can either be ticked or not, the number of combinations is 2 to the power 3.
233 = 18 combinations.
3 items each in 3 categories gives 3*3*3 = 27 possible combinations.
11*3*3 = 99 combinations.
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9