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The sixth digit of the NAICS code is used to define national industries
check digit
If you see vertical lines on a bill payment envelope, they are located on the bottom. The bar code allows the U.S. Postal Service to mechanically sort the mail which saves them time and money.
Digit Check
the answer is 1010 the 1st digit is 1 x 8 = 8 the 2nd digit is 0 x 4 = 0 the 3rd digit is 1 x 2 = 2 the 4th digit is 0x 1 =0 i hope this helps