In this paper, we claim that a common underlying structure–a skeleton
    structure–is present behind discrete-time quantum walks (QWs) on a
    one-dimensional lattice with a homogeneous coin matrix. This skeleton structure
    is independent of the initial state, and partially, even of the coin matrix.
    This structure is best interpreted in the context of quantum-walk-replicating
    random walks (QWRWs), i.e., random walks that replicate the probability
    distribution of quantum walks, where this newly found structure acts as a
    simplified formula for the transition probability. Additionally, we construct a
    random walk whose transition probabilities are defined by the skeleton
    structure and demonstrate that the resultant properties of the walkers are
    similar to both the original QWs and QWRWs.

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