CALCULOS substractions - full set

the full substraction set, including the 4 levels !
level 1 : 13 cards - 4 calculus per card
level 2 : 20 cards - 5 calculus per card
level 3 : 30 cards - 6 calculus per card
level 4 : 55 cards - 8 calculus per card
 
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