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Below is a listing of all commands and a brief description for each.

Take variable. Add amount to it.

Make variable be one less.

Make variable become quotient after division.

Tell whether value is negative or not.

Tell whether value is non-negative or not.

Tell whether the input is not a numeric value.

Tell whether value is non-positive or not.

Check whether value is non-zero.

Tell whether the input is a numeric value.

Tell whether value is positive or not.

Check whether value is zero or not.

Make variable become a multiple of itself.

Take variable and subtract amount from it.