Checks to see if the frond xy will conflict with a frond on the left side of the embedding.

def __check_left_side_conflict(x, y, dfs_data):
    """Checks to see if the frond xy will conflict with a frond on the left side of the embedding."""
    l = dfs_data['FG']['l']
    w, z = dfs_data['LF'][l]
    return __check_conflict_fronds(x, y, w, z, dfs_data)