1*x2 +1*x3 +1*x4 +1*x7 -1*q = 0 1*x1 +1*x2 +1*x4 +1*x5 +1*x6 -1*p = 0 1*x7 >= 0 1*x6 >= 0 1*x5 >= 0 1*x4 >= 0 1*x3 >= 0 1*x2 >= 0 1*x2 +1*x3 +1*x4 +1*x7 -1 >= 0 1*x1 >= 0 1*x1 +1*x2 +1*x4 +1*x5 +1*x6 -1 >= 0