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Similarly, the PI index is defined as $PI(G) = \\sum_{e=uv \\in E(G)}(m_u(e) + m_v(e))$. In this paper it is shown how the problem of calculating the indices of a benzenoid system can be reduced to the problem of calculating weighted indices of three different weighted quotient trees. 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Similarly, the PI index is defined as $PI(G) = \\sum_{e=uv \\in E(G)}(m_u(e) + m_v(e))$. In this paper it is shown how the problem of calculating the indices of a benzenoid system can be reduced to the problem of calculating weighted indices of three different weighted quotient trees. 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