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In the former USSR there was a table to test the observation. Its name is “Entertaining table.” Note the time and try to find the numbers consecutively from 1 to 90…

If you can find these numbers in:
5-10 minutes, then you have exceptional power of observation.
10-15 minutes – a good one.
15-20 minutes – the average.
20-25 minutes – it is satisfactory.

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