Book3

0) 15 minutes

29-Dec-06

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2) Count up to subtract 1

29-Dec-06

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3) Count up to subtract 2

29-Dec-06

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4) Counting up time

29-Dec-06

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5) Elapsed Time

23-Feb-07

Elapsed Time

6) Half an hour

29-Dec-06

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9) Regroup to subtract

29-Dec-06

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10) Regroup to subtract 1

29-Dec-06

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