Read the excerpt below and answer the question. And from this chasm, with ceaseless turmoil seething,
As if this earth in fast thick pants were breathing,
A mighty fountain momently was forced:
20 Amid whose swift half-intermitted burst
Huge fragments vaulted like rebounding hail,
Or chaffy grain beneath the thresher's flail:
And 'mid these dancing rocks at once and ever
It flung up momently the sacred river. ("Kubla Khan," lines 17-24)

The rhythm in the excerpted lines of Coleridge's poem can be compared to .