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Arranging several components along a path means connecting them by an AND‐ operation and arranging several components in parallel paths represents and OR‐operation. In essence, a RBD is a graphical representation of a Boolean expression. Boolean expressions are discussed further in Section 4.6. The system function SF in Figure 2.10 is seen to be up if block 1 is up AND block 2 OR block 3 is up.