def METHOD_NAME(anc_block, desc_block):
    dim = anc_block.count("_") + 1
    if (len(desc_block.replace(":", "")) - len(anc_block.replace(":", ""))) / dim != 1:
        return False
    for aind, dind in zip(anc_block.split("_"), desc_block.split("_")):
        if not dind.startswith(aind):
            return False
    return True