The two poetic elements present in the stanza are:
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Alliteration - This is evident in the repetition of the initial 's' sound in "Silly, simpering, sideways sellout!" and the 'm' sound in "man" and "machine."
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Consonance - This can be seen with the repetition of consonant sounds, particularly the 'n' sound in "neither" and "man," and in "monstrously more" with the 'm' sound.
Therefore, the correct answers are alliteration and consonance.