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These signals add value to the lyrics and the overall meaning of the song "Let it go" in a way that it provides or gives a more colorful presentation of the song using flowery and idiomatic expressions to further express the feelings and situations where the character is in. These signals are like seasoning in the song, they attract readers and listeners to continue listening to the song over and over again thus, slowly grasping the essence and meaning of the song in the process of repetition. 
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