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Example of neighborhoodAdd procedure. Residue 4 ∈ P2 is chosen to be aligned. The pairing may be feasible, as shown in (a) or an unfeasible one (b). In this case, feasibility would be restored by deleting the pairings (3 ∈ P1, 2 ∈ P2) and (5 ∈ P1, 3 ∈ P2).
