Suggestions on how to program the following?

"a must be less than b, which must be less than c, etc."

I'm optimizing a, b, c, and d, but the numerical value of each must be from 
smallest to largest, otherwise the optimization is worthless.  Therefore it's 
either true or false, and only optimizes values of the variables that maintain 
the "true" nature of the increasing value of each variable.

Thanks for any suggestions.

J

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