def _trace_D(gj, p_i, Dxtrav):
    for h in Dxtrav:
        if h[gj] == p_i:
            return h
    return None
``z`` value used for verification.
dataset/ETHPy150Open sympy/sympy/sympy/combinatorics/tensor_can.py/_trace_D--crossover with--dataset/ETHPy150Open letsencrypt/letsencrypt/acme/acme/challenges.py/TLSSNI01Response.z