Ahem … I'm going to speak ~! ! Na ~ suppose there are four kinds of meat dishes, three kinds of vegetarian dishes and one or two kinds of soup: then ① and A can be matched with A, B, C and D; ①. B can also be matched with A, B, C and D; (1) and there are four in the same way as C; So there are 12 kinds ~! (2) and (a) can be matched with A, B, C and D; (2) There are four reasons for being the same as B; ② It is the same as C, so there are 12 kinds, so * * * is 24 kinds! ! ! ohyeah~! Have I made myself clear? O(∩_∩)O~~
Hope to solve your problem, hope to adopt ~!