The other day, my senior daughter said

"I want to lose weight of 3kg in twenty days"

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Now I am a world-wide fame of of diet mathematics (self-designation)

So I initiated my knowledge of diet approach in the present into her.

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In addition,

when she said "in twenty days" at this time,

I decided that

I never asked her the reason and background

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Well, let me say, "Go for it"