What is the rhyme scheme from emily dickinson's poem"712"

The poem has 16 lines divided equally across four stanzas. The poem uses iambic meter (one unstressed syllable followed by a stressed syllable):

I like to see it lap the miles,

And lick the valleys up,

The poem uses the rhyme scheme abcb as evident from the following lines:

To fit its sides, and crawl between,

Complaining all the while In horrid, hooting stanza;

Then chase itself down hill

The words while and hill do not rhyme perfectly, but they sound similar. This type of rhyme is called slant rhyme, and it is used throughout the poem.

some sort of sound device i believe.