0) Elapsed Time

23-Feb-07

Elapsed Time

1) Regroup to subtract

29-Dec-06

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2) Regroup to subtract 1

29-Dec-06

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3) Count up to subtract 2

29-Dec-06

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4) Count up to subtract 1

29-Dec-06

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6) Counting up time

29-Dec-06

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7) 15 minutes

29-Dec-06

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8) Half an hour

29-Dec-06

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11) How long something takes

29-Dec-06

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