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Can you say the sum?

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  • Fifteen plus three equals eighteen.
    ...
  • Seventeen plus three equals twenty.
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  • Eleven minus one equals ten.
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  • Six minus four equals two.
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  • Ten minus five equals five.
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  • Five minus three equals two.
    ...
  • Two plus five equals seven.
    ...
  • Thirteen plus six equals nineteen.
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  • Nine plus six equals fifteen.
    ...
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