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The term series–parallel structure is not used in the same way by all authors. Some authors use the term to describe a series structure, where one or more of the blocks have added redundancy, that is, have parallel paths. The same authors use the term “parallel‐series structure” to describe a parallel structure where two or more blocks appear in at least one of the parallel paths. In this book, we use the term series–parallel structure to describe a structure, where the blocks are arranged in any combination of series and parallel structures (as indicated in Figure 2.16).