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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def merkleroot(merkletree: 'MerkleTreeState') -> Locksroot: """ Return the root element of the merkle tree. """

    assert merkletree.layers, 'the merkle tree layers are empty'
    assert merkletree.layers[MERKLEROOT], 'the root layer is empty'

    return Locksroot(merkletree.layers[MERKLEROOT][0])