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IndividualL Kekule valence structures o conjugated hydrocarbons are examined and the relative role of the opposing "aronatic" and "antiaromatic" contributions scrutinized. The work follows our previously proposed classification of conjugated systeris based on the enumeration of )4n+2 and 4n conjugated circuits. Here we would like to draw the attention to molecular formulas obtained by a partial superposition of selected kekule valence structures and the situations in which they may play the dominant role and represent molecules ade-

On the role of kekule valence structures