The stanza contains the following poetic elements:
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Alliteration - This is the repetition of consonant sounds at the beginning of words, such as in "silly, simpering, sideways sellout."
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Assonance - This is the repetition of vowel sounds within words in a line, as seen in the repeated 'i' sounds in "silly," "simpering," and "sideways."
So the two correct answers are alliteration and assonance.