:term:`WFN <WFN (CCENERGY)>`
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      Wavefunction type 

      * **Type**: string
      * **Possible Values**: CCSD, CCSD\_T, EOM\_CCSD, LEOM\_CCSD, BCCD, BCCD\_T, CC2, CC3, EOM\_CC2, EOM\_CC3, CCSD\_MVD
      * **Default**: NONE