Arda lingwa

Consonants
(1) When followed by /f~v/

(2) When followed by /k~g/

(3) When /i/ is followed by /j/; or when a descending diphthong is followed by an ascending diphthong of the same nature (e.g. /äj.jä/ -> /äj.çä/)

(4) Associated with the digrams "dz" and "dj"

(5) When /u/ is followed by /w/; or when a descending diphthong is followed by an ascending diphthong of the same nature (e.g. /äw.wä/ -> /äw.ʍä/

(6) This sound isn't written, but implied within the text and speech. It's used instead of the glottal stop, between vowels or in a begining of a word that begins with a vowel.