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The exception-merge task can also be referred as an “OR-merge” or "ABORT-merge". As soon as one token arrives at the exception-merge ALL other tokens still in the process are removed. This is especially useful in exception conditions, when any decision makes the other tasks unnecessary. For example, an order process which is split up into several paths. But when the customer cancels the order, it  does not make sense that all three paths have to process all the steps until the tokens can be merged (the customer has canceled the order anyway).