Do you mean how can you work out what classes can use it by working backwards (you are given a number, and you work out from that number the classes that can use it)?
If so, you work your way up the list by taking away. Take away the largest numer you can, then the next largest...etc
Eg, if you're given 4128 you take away the largest (4096) which leaves you with 32...this is a complete number so ti stops there. So Druid and Mage can use.
If the number was 17536:
17536 - 16384 (BeastLord) = 1152
1152 - 1024 (Necro) = 128
128 = (Bard).
So an item with class value of 17536 can be used by Beastlord, Necro and Bard.
As soon as you get to a complete number that you can asign to a class you stop (eg don't take away 32 from 64).
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