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The framework can be accessed by the topology method.
If the Zn1, Zn2, BTC3-, and L are viewed as 4-, 3-, 3-, and
2-connected nodes, respectively, such special framework
features a trinodal (3, 4)-connected net with its Schl? afli
symbol (6 8^2)4(6^2 8^2 10^2)
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