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Formation of a solute in water. A solute element p is transferred from bulk water (site i′) to its final position (i) in the growing solute, while water w is moved from i to i′. Site j at a distance r from i is occupied by solute; sites k and k′ contain water with occupancies sk ≤ 1 and sk′ = 1; likewise for q and q′; si and sj are assumed to be unity.
