(I) can't say as I do(, can't say as I don't)

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(I) can't say as I do(, can't say as I don't)

I don't know with certainty. A: "How many people are coming to dinner tonight?" B: "Hmm, can't say as I do, can't say as I don't." They asked me if I know how to create a spreadsheet like that, but I can't say as I do.
See also: say
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