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Didactics of mathematics --- rekenen --- wiskunde --- 51 <07> --- 510.3 --- 51 <07> Mathematics--Cursussen. Instructies. Onderwijs --- Mathematics--Cursussen. Instructies. Onderwijs --- Wiskunde --- Secundair onderwijs --- Rekenen --- Zonsondergang --- Sterren --- Ster (hemellichaam)