kün-

Usage notes
The form taken by this prefix depends on the first syllable of the stem it attaches to:
 * if the first syllable begins with a vowel or consonant other than or  and its vowel is anything but  or.
 * if the first syllable begins with a vowel or consonant other than or  and its vowel is.
 * if the first syllable begins with or . If it begins with, the  and  assimilate together into.
 * occasionally if the first syllable begins with a vowel or consonant other than  or  and its vowel is.
 * if the first syllable begins with and its vowel is anything but  or.
 * if the first syllable begins with and its vowel is.
 * if the first syllable begins with and its vowel is.
 * if the first syllable begins with two consonants.