... ( gl, gm, gn, gw, gy ) and ǧ occurs only before vowels ( ǧa, ǧe, ǧi, ǧo, ǧu, ǧaŋ, ǧiŋ, ǧuŋ ). Based on the above rule you can easily fill the missing letters in the exercise below. But you can also listen to the pronunciation to get some practice: http://lakotadictionary.org/phpBB3/download/quizzes/07-05.mp3 ...