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Spaced Repetition Match
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11 digits
usps
15 digits
airline tickets
12 digits
upc
coda bars
16 digits
a1+…+a10 mod9
usps formula
a1…a14 mod7
airline ticket formula
3a1+a2+…+3a11+a12
upc formula
add odd, multiply by 2, add no of digits higher than 4, add all even
coda bars formula
if remainder is the last digit
to check if usps is valid
if remainder is the last digit
to check if airline ticket is valid
if last digit is 0
to check if upc is valid
if last digit is 0
to check if coda bars is valid