De achterkant van de usem-kaartjes kent een multifunctioneel ruitjespatroon, bestaande uit ruitjes van 0,5 x 0,5 cm.
Sommige klanten kopen de usem-kaartjes speciaal voor de achterkant. En de mathematicus in ons begrijpt dat wel; je zou zelfs kunnen spreken van een dubbele A-kant.
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