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A benchmark study on all possible density functional theory ( DFT ) methods in Gaussian09 is done to locate functionals that agree well with CCSD / aug - cc - pVTZ geometry and Ave - CCSD ( T ) / ( Q - T ) interaction energy ( Eint ) for small non - covalently interacting molecular dimers in " dispersion - dominated " ( class 1 ) , " dipole - induced dipole " ( class 2 ) , and " dipole - dipole " ( class 3 ) classes .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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