Answer:
digit: 60
kindness: 10080
mathematician: 129729600
Explanation:
sorry if this isn't right, and sorry I don't have an explanation but this worked for me.
Kindness- skinned, sinned, kissed, skeins, skies, sides, kind, kinds, end 86 words
Digit- dig, it 8
Mathematician- titanic, intact, manic, cat, math, … 346
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