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The text of the poem as published in the quarterly journal is not identical to the text of the poem published in the stand-alone volume.
Many critics believe that the poet's explanatory notes remove certain ambiguities of the poem and make it less interesting as a result.
The publishers of the stand-alone volume requested the explanatory notes from the poet in order to make the book attractive to readers who already had a copy of the poem in a journal issue.
Correspondence between the poet and the publisher reveals that the poet's explanatory notes went through several drafts.