Use "ck" promptly following vowels and "k" following One more consonant. In 1-syllable words and phrases, decide on "ck" once the word has a short vowel and no other consonant concerning the vowel and the tip in the phrase, like "quack," "crack," "deficiency," or "duck. Together with availability, low approach https://charlieebyyu.blogocial.com/the-definitive-guide-to-dsl-spoken-64112009