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the Shapley value is 1 | S y m ( n ) | ∑ σ ∈ S y m ( n ) f i ( σ ( 1 ) , … , σ ( n ) ) {\displaystyle {\frac {1}{|\mathrm {Sym} (n)|}}\sum _{\sigma \in \mathrm {Sym} (n)}f_{i}(\sigma (1),\ldots ,\sigma (n))}