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Dear All,
I want to compute a tree-level scattering diagram (see eq. (9), page 6 in http://arxiv.org/abs/hep-th/0211072). The diagram consists of two 2-scalar-1-graviton vertices and one graviton propagator (see the appendix in the aforementioned paper). I want to write a code that contracts the indices and simplifies the expression as much as possible. Could someone please help me?