Answer: yet and but, because when used in a sentence these words express a contradictory tone, which means there is a difference.
The poetic technique that Robert Browning used in his poem "My Last Duchess" is <span>enjambment.
</span>That technique means that the thought found in one line of the poem does not end with the end of that line, but rather continues into the following line. There are no harsh endings of thought at the end of one line.
Hope this helps :)
