Wiktionary:Sylheti transliteration

Conjuncts
Conjuncts are transliterated as they are pronounced. While the pronunciation of some conjuncts is evident by their components, others are pronounced quite differently than the spelling would suggest. These include the following:
 * ꠇ + ꠇ = ꠇ꠆ꠇ (kkô)
 * ꠇ + ꠈ = ꠇ꠆ꠈ (kkô)
 * ꠌ + ꠌ = ꠌ꠆ꠌ (ccô)
 * ꠌ + ꠍ = ꠌ꠆ꠍ (ccô)