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"the relevance of the idea to your life"
When analyzing or writing a paper about a fictional work, you could analyze the symbolism and/or implications in the piece of fiction. In the academic setting, it simply doesn't matter if ideas conveyed in writing impact your life or not.
Answer: Both use everyday language.
Both Robert Frost's "Mending Wall" and Carl Sandburg's "Frost" use everyday language. This is their main similarity. This type of vocabulary allows them to convey their ideas in a way that is accessible to everyone. It is also a characteristic that sets them apart from other more traditional poets.
