how to deal with number

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Hi all,

In ABAP, can I get ther set of number{2, 3, 4, 5} if I pass the parameter the first number '2' and the last number '5'.

And if A={2, 3, 4, 5} and B = {3, 5}, is there a function which can caculat A - B = {2,4}?

Thanks

Kical