What is the full rhyme scheme of "The Raven" by Edgar Allan Poe?

This excellent Gothic poem actually has a very regular
rhyme scheme, that helps to contribute towards the unrelenting and inexorable pace of
the poem that drives its speaker on in his tortured and frenzied thoughts as he tortures
himself over the memory of his "lost Lenore."

When we work
out the rhyme scheme of a poem, we look at a stanza and assign a letter to each separate
rhyme that there is, repeating the letter is the same rhyme occurs. Thus, examining the
first stanza, we assign the letter "A" to "weary," then "B" to "lore." "Tapping"
represents another rhyme, so we give that line "C" and then finally we can see that
"door," "door" and "more," the words that end lines 4, 5 and 6, match the rhyme of
"lore," so we give these lines the letter B. Therefore the poem has a regular rhyme
scheme that can be expressed in the following way: A B C B B B. This is continued
throughout the poem.