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nā = plural but ka/ke = singular
nā keiki = the children but ke keiki = the child
Ka is the default while ke precedes words starting with k, e, a, o (note that the ‘okina before the vowels means that typically ka is used). There are certain exceptions that can take ke like po‘o, pākaukau, ‘ala, mele (when it means song), and pā just to name a few.