(Noob) Tips for a more efficient command? (Mode 2811)

[Raziel]

I am trying to find a password which can only contain lowercase letters, uppercase letters and numbers, and its length can be between 6 and 12 characters. It's a mode 2811 (IPB)

Can somebody help me with an efficient command for this? I have tried this:

Code:

hashcat64.exe -m 2811 -a 3 -w 3 --hex-charset -1 charsets/DES_full.charset -o example.dict example0.hash ?a?a?a?a?a?a?a?a?a?a?a?a --increment --increment-min 4 --increment-max 12

However the command above doesn't seem efficient because I am searching for symbols as well (and the password doesn't contain any symbol)

Any advice is welcome