They are vital to the structure of the poem as they signal a return to the topic and imagery that's used in the opening stanza.
A structure of a poem simply means the rhyming lines, sections, stanzas, etc in the poem.
The references to “ideas on horseback” and “long-haired virtues” fit into the overall structure of the poem as they signal a return to the topic and imagery that's used in the opening stanza.
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