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My solution is slightly extended as I feel the letter check (I, O & Q) is missed out by most of the solutions. Try this out..
If the VIN with all alphabets ABCDEFGHIJKLMNOPQ had Zero in the 9th place instead of letter "I" (i.e. ABCDEFGH0JKLMNOPQ), the regular 9th place VIN check would have validated this as a correct one.