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2*2*2*2 = 16, counting one with no toppings.
32 combinations. 4 of these will have no toppings, or all three toppings, 12 will have one topping and another 12 will have 2 toppings.
18
16 because 4 times 4 is 16 and you use each one first then the next one and the next one
200 different combinations. :)