It has become increasingly common to use 'c' in place of 'ch'. In common with other Bantu languages, as affixes are added, combinations of vowels may contract and consonants may change. For example, 'aa' changes to a long 'a', 'ae' and 'ai' change to 'e', and 'ao' and 'au' change to 'o (in other cases, a 'y' is often used to separate other combinations of vowels). The nasal 'n' changes to 'm' before 'b' or 'p', and is pronounced ŋ before 'k' or 'g'; after 'n', 'l' changes to 'd'. These rules will all be implicit in the tables given below.