The syntax for Crunch is:
crunch min max charset options
The min and max are the minimum and maximum lengths (respectively) for your desired wordlist. By default charset is not required, but you can use it to limit the characters of your wordlist to the ones you specify. If you choose to use charset then you must maintain the correct order, which is lowUP123@%# (lowercase letters, then uppercase letters, then numbers and finally symbols). You can skip any of them, but the order must always remain the same.
crunch 2 6 qrs347 | grep -vFf file01
The command above will produce a wordlist for every possible combination of the characters qrs347 from 2 to 6 characters in length.
You can modify the command depending on your needs