The spelling of /k/ is <c>, <cc>, <ck> or <k>. The /w/ sound is spelled <w> or <wh>. The contrasts can occur initially or medially but not finally.
This is a contrast between a voiceless stop and a voiced semivowel. It causes no problems.
Interesting pairs include:
The figure for the mean density is 2%. The set makes 131 semantic contrasts, a loading of 52%.
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Credit: John Higgins