(Romeo) well, you missed that hit.
I sentence that contains an element of bias could be one that states an opinion. For example, "I think her shoes are ugly, mine are better." the person talking is biased because they really like their shoes.
In literature a symbol can be subtle or obvious. In 'The Raven' the symbol is obvious. Poe himself meant the Raven to symbolize 'mournful, never-ending remembrance.' Our narrator's sorrow for his lost, perfect maiden Lenore is the driving force behind his conversation with the Raven
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hope this helps