The constraint x₁ + x₂ + x₃ + x₄ $\le$ 2 means that two out of the first four projects must be selected.

Name: The constraint x 1 + x 2 + x 3 + x 4 $\le$ 2 means that two out of the first four projects must be selected.
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The constraint actually means that the sum of the products of xS1U1BijS1U1B0 and F1F1F1S1 for i from 1 to 4 should be less than or equal to F1F1F10. It does not specify that two out of the four projects must be selected.

The Constraint X1 + X2 + X3 + X4 ≤\le≤ 2 Means That Two Out of the First Four Projects

The Constraint X₁ + X₂ + X₃ + X₄ $\le$ 2 Means That Two Out of the First Four Projects