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When a network contains only one kind of atom (i.e. the network is chemically homogeneous), it is called one component (or unary). Networks are termed binary when they contain only two kinds of atoms, and multicomponent if three or more distinct atoms are present. The (molar) fractions {x_i} of atoms of the different components specify the average chemical composition of a network. In this paper, we discuss only unary or binary networks of type A_xB_{(1 − x)}, where x represents the mole fraction of A atoms.