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Suppose there was a change in the relation between two relata. Does this necessarily mean that both changed? Or is this only proof for the changing of at least one? We argue that the latter is the case.

To prove that it is not necessary for both relata to change in order for a change in relations to occur, all we need is to offer an exception to the universal statement: “it is necessary for both relata to change, in order for a change in relations to occur”.

So we say: let us take the example of the “taller than” relation in the proposition “Zayd is taller than ‘Amr”. Now suppose that this relation changed, such that Zayd was no longer taller than ‘Amr. Does this necessarily mean that the heights of both Zayd and ‘Amr changed? No. For it is possible for ‘Amr to have grown taller than Zayd, when Zayd’s height remained constant. 

Thus, it is sufficient for only one relatum to change, in order for the relation between it and another to change.