It should be noted that some of the methods that are used in sound devices are rhyme, repetition, alliteration, and assonance.
Your information is incomplete as you didn't provide the poem. Therefore, an overview will be given. Repetition simply means repeating words in order to create emphasis.
Some poets use sound devices in order to create emotional response. Sound devices are used to create effects and reinforce meaning. This can be through rhyme, repetition, alliteration, and assonance.
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