Lottery codes like v-trac or any other mix of number combinations to make a set of lottery numbers for coding are pre-programmed wheels.
I will use lottery number 158 for example.
Lottery number 158 = 214 v-trac. The 214 v-track = 103-108-603-608-153-158-653-658. With a pre-programmed code the lottery digit must fall in that code.
If you was to wheel all six digits you would have a six digit wheel. 0-1-3-5-6-8 giving you lottery numbers 013-015-016-018-035-036-038-056-058-068-135-136-138-156-158-168-356-358-368-568 not counting lottery doubles.
Those 20 no match lottery numbers would be V-trac codes 112-114-122-144-124-224-244.
You get the idea.