CPIP doubling halving, adding and subtracting

CPIP doubling halving, adding and subtracting
CPIP doubling halving, adding and subtracting
CPIP doubling halving, adding and subtracting
CPIP doubling halving, adding and subtracting
CPIP doubling halving, adding and subtracting
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Instrucciones del autor

this is a preparation for cambridge checkpoint