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Mul Mul Pow Add Mul sech pi x5 x7 Add x0 -1 Mul Add Mul sech pi x5 x7 log Add Mul sech pi x5 x7 Pow Mul sqrt Add Pow Add Mul sech pi x5 x7 x0 -1 sqrt Add 1 Pow Add Mul sech pi x5 x7 x0 -1 