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Each phenylene molecule (containing n six-membered and n–1 four-membered rings) is in a unique manner associated to a catacondensed benzenoid system (containing n six-membered rings). The algebraic structure count of the phenylene is equal to the number of Kekulé structures of the corresponding benzenoid system. This latter quantity is easily computed.
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İvan Gutman (1993) studied this question.
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