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Measuring striving for understanding and learning value of geometry: a validity study (13h 53min, jun 25, 2017 y – 11h 22min, mar 1, 2018 y)

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14 Dec 2017

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13h 53min, jun 25, 2017 y

11h 22min, mar 1, 2018 y

~ 8 months

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