The coupon code starts with a 5 to indicate that it is a coupon, then the next 5 numbers are positions two through six of the company prefix, the next three digits are the family code. These are assigned by the manufacturer to group products within a family of products. A family would be shoes – all sizes or colors, Vitamin Water (different flavors), etc. The next two numbers are the value code. In the case of the example here, 01 means buy two, get one free, and then, the last number is a check-digit
If you want more information about coupon codes, go to www.couponpros.org