One can understand the structure of V a 1 , a 2 , … … a m c by considering fusion processes one pair of anyons at a time. There are many arbitrary ways one can do this, each of which can be used to derive a different decomposition of V a 1 , … … a m c into pairs of pants. One possible choice is to first fuse a 1 and a 2 into b 1 , then fuse b 1 and a 3 into b 2 , and so on. This approach shows us that V a 1 , a 2 , … … a m c = ⨁ ⨁ { b j } ( V a 1 , a 2 b 1 ⊗ ⊗ V b 1 , a 3 b 2 ⊗ ⊗ V b 2 , a 4 b 3 … … V b m − − 3 , a m − − 1 b m − − 2 ⊗ ⊗ V b m − − 2 , a m c ) , and correspondingly N a 1 , … … a m c = ( ∏ ∏ j = 2 m N a j ) a 1 c where N a is the matrix defined in the previous section.