It’s a bit long, but here’s Ars Technica’s explanation. ![]() Let's take this series of possible last digits (these were the ones I used with my lock): 38.5, 35.5, 32, 28.5, 25.5 22, 19, 15.5, 12, 8.5, 5.5, 2 Sometimes it is very difficult to tell if something falls on the digit or between, so there should be 7 that have a. There will usually be 5 ranges that center on one of these "0.5" numbers, so that eliminates 5 of the 12 possible last digits. First, take away all of the ones that have a. The range that is centered on a whole number (or closest to a whole number) will be possible last digits of the combination. ![]() This is a lot more involved with newer locks.
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