:term:`CEPA_VABCD_DIRECT <CEPA_VABCD_DIRECT (CEPA)>`
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      Use integral-direct implementation of the (ac|bd) t(ij,cd) contraction? AO integrals will be generated on the fly. The CEPA iterations will be slower, but the AO->MO integral transform will be faster, and the out-of-core sort of the (AC|BD) integrals will be avoided.

      * **Type**: :ref:`boolean <op_c_boolean>`
      * **Default**: false