doubt writing the code

[María Vargas Magán]

Hello. I would like to define the subset S contained in N:={1..n} and that S is not equal to N at the same time and I don´t know how to do it. I've thought define the restriction 

subject to not_equal_to_N:
     card(S) =! card(N);

so that S is not equal to N. 

Can you help me? Thanks !! :)

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