Read the excerpt from "digging." the cold smell of potato mould, the squelch and slap of soggy peat, the curt cuts of an edge through living roots awaken in my head. but i’ve no spade to follow men like them. which words in the excerpt are linked by alliteration?

Squelch, slap, soggy
curt cuts

Alliteration is the repetition of sounds at the beginning of a group of words. In this case there are two different groups of words that could be examples of alliteration. The first is in the section "the squelch and slap of soggy meat". The /s/ sound is repeated at the beginning three times in this part of the excerpt. The second is "curt cuts". In this two word phrase, the hard /c/ sound is repeated. 
Keep in mind when identifying alliteration it's important to hear the sound the word makes. Sometimes when you just look for a repeated letter it is incorrect. For example, the circular cheese is cut. Even though a majority of words begin with c, none of them begin with the same sound.