CVXPY
Minimize
  Sum(x, None, False)
Subject To
 20: 1.0 <= Sum(x, 1, False)
Bounds
 0.0 <= x
End
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AFTER COMPILATION
Minimize
  C0 + C1 + C2 + C3
Subject To
 R0: - C0 <= 0
 R1: - C1 <= 0
 R2: - C2 <= 0
 R3: - C3 <= 0
 R4: - C0 - C2 <= -1
 R5: - C1 - C3 <= -1
Bounds
 C0 free
 C1 free
 C2 free
 C3 free
End
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GUROBI
Minimize
  x[0,0] + x[0,1] + x[1,0] + x[1,1]
Subject To
 20[0]: x[0,0] + x[0,1] >= 1
 20[1]: x[1,0] + x[1,1] >= 1
Bounds
End