Thanks @odow One question that I have is that:
I was wondering if there is any difference between x[13, 48,99] + x[71, 58, 99] >= 2 and x[(13, 48,99)] + x[(71, 58, 99)] >= 2 for Julia?
If so, do you know of any method to convert x[(13, 48,99)] + x[(71, 58, 99)] >= 2 to x[13, 48,99] + x[71, 58, 99] >= 2 in general case (works for anything similar)