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Alain Ertveldt
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Vive la Belgique (Anoir 1C1)
Activity
Alain Ertveldt
Rosace de Belgique (Clara)
Activity
Alain Ertveldt
Rosace de Belgique
Activity
Alain Ertveldt
Triangle et son cercle circonscrit
Activity
Alain Ertveldt
Positions relatives de 2 cercles
Activity
Alain Ertveldt
