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In Sheeran, Mary, and Gunnar Stålmarck: A tutorial on Stålmarck’s proof procedure for propositional logic there is an example application of the method to(((p -> p) -> p) -> (p -> q)) -> (((p -> q) -> p) -> q) in which the authors mention that a triplets is "dropped" once it triggered a change in the equivalence relation, i.e., a simple rule applied for the triplet.

I am not sure that this is generally possible. Can a triplet trigger multiple changes or can it always be dropped once it triggers such a change?

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