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How many function f exist with domain {1,2,3,4,5,6,7,8,9,10} and co-domain {2,3,4,5,6} such that f(1)=f(10), and f(2)=f(8)

How many function f exist with domain {1,2,3,4,5,6,7,8,9,10} and co-domain {2,3,4,5,6} such that f(1)=f(10), and f(2)=f(8)

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