Final answer:
Coleridge's line 6 from 'Kubla Khan' contains assonance, consonance, and alliteration, but not onomatopoeia, as part of its sound devices.
Step-by-step explanation:
In line 6 of Coleridge's 'Kubla Khan', 'So twice five miles of fertile ground,' several sound devices are used to create a musical effect. We can identify assonance in the repetition of the 'i' sound in 'twice' and 'miles,' consonance in the repetition of the 's' sound throughout the line, and alliteration in the use of 'f' sounds with 'five' and 'fertile.' However, there is no onomatopoeia, as there is no use of words that imitate sounds.