The next round gives you less help.
Practice the combination you'll actually use.
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Enter the combination from your school's locker assignment.
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Teaches a standard three-number dial lock, on dials up to 0–59.
Enter the recovery code from your receipt.
Practice as much as you like, with your own combination.
Keep this code. It gets your practice back if you change phones or clear your browser. It is in your emailed receipt too.