
If you can't solve a problem, then there is an easier problem you can solve. Find it.
George Polya
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okt
15
2020

If you can't solve a problem, then there is an easier problem you can solve. Find it.
George Polya
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Do first things first, and second things not at all. Peter Drucker |
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Understanding How We Learn Bij Bol.com | Managementboek | Amazon.nl |