<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def find_biclique_embedding(a, b, m, n=None, t=None, target_edges=None):
 """Find an embedding for a biclique in a Chimera graph. Given a target :term:`Chimera` graph size, and a biclique (a bipartite graph where every vertex in a set in connected to all vertices in the other set), attempts to find an embedding. Args: a (int/iterable):
 Left shore of the biclique to embed. If a is an integer, generates an embedding for a biclique with the left shore of size a labelled [0,a-1]. If a is an iterable, generates an embedding for a biclique with the left shore of size len(a), where iterable a is the variable labels. b (int/iterable):
 Right shore of the biclique to embed.If b is an integer, generates an embedding for a biclique with the right shore of size b labelled [0,b-1]. If b is an iterable, generates an embedding for a biclique with the right shore of size len(b), where iterable b provides the variable labels. m (int):
 Number of rows in the Chimera lattice. n (int, optional, default=m):
 Number of columns in the Chimera lattice. t (int, optional, default 4):
 Size of the shore within each Chimera tile. target_edges (iterable[edge]):
 A list of edges in the target Chimera graph. Nodes are labelled as returned by :func:`~dwave_networkx.generators.chimera_graph`. Returns: tuple: A 2-tuple containing: dict: An embedding mapping the left shore of the biclique to the Chimera lattice. dict: An embedding mapping the right shore of the biclique to the Chimera lattice Examples: This example finds an embedding for an alphanumerically labeled biclique in a single Chimera unit cell. {'a': [4], 'b': [5], 'c': [6]} {'d': [0], 'e': [1]} """

    _, anodes = a
    _, bnodes = b

    m, n, t, target_edges = _chimera_input(m, n, t, target_edges)
    embedding = processor(target_edges, M=m, N=n, L=t).tightestNativeBiClique(len(anodes), len(bnodes))

    if not embedding:
        raise ValueError("cannot find a K{},{} embedding for given Chimera lattice".format(a, b))

    left, right = embedding
    return dict(zip(anodes, left)), dict(zip(bnodes, right))