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Short, simple - Why doesn't it work as a function


{#, a} & /@ {a, b, c}

gives {{a, a}, {b, a}, {c, a}} which is what i want.

why[x_List] := {#, a} & /@ x;
why[{a, b, c}]

gives.

{{a, a}, {{b, a}, {{c, a}, {}}}}

not what I want.

I've checked the FullForms and they are different - why??


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