Fred solved my/our problem:
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Dear all, Im trying to sum over my binary decision variable X(f,g,t) which equals 1 if family f cooks meal g on day t and 0 otherwise. I want at least 10 days between am family cooking twice in a month. For example: f1*f17; g1*g30; t1*t20* Some of the families have to cook twice. To have a break bet...