:term:`AO_BASIS <AO_BASIS (DCFT)>`
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      Controls whether to avoid the AO->MO transformation of the two-electron integrals for the four-virtual case (<VV||VV>) by computing the corresponding terms in the AO basis. AO_BASIS = DISK algorithm reduces the memory requirements. It is, however, less efficient due to the extra I/O, so the default algorithm is preferred.

      * **Type**: string
      * **Possible Values**: NONE, DISK
      * **Default**: NONE