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How to memorise the raven
Obtain a copy of the poem.
A printed version of the poem is best for memorisation purposes. You'll be able to visualise the poem in space and better learn the order of the stanzas as a result of their relative positions on the page.
A digital version will also suffice; it is freely available online on various websites dedicated to poetry and literature. Look up any words, metaphors or sentences you don't understand.