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SUBROUTINE cisd_2pdm_pppp_mo_1(d_a,k_a_offset,d_b,k_b_offset,d_c,k
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C This is a Fortran77 program generated by Tensor Contraction Engine v.1.0
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C Copyright (c) Battelle & Pacific Northwest National Laboratory (2002)
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C i0 ( p1 p2 p3 p4 )_yt + = 1/2 * Sum ( h5 h6 ) * t ( p1 p2 h5 h6 )_t * y ( h5 h6 p3 p4 )_y