how to use just lower case alpha numeric only?

[yugiohle]

I am noob, try to crack .7z, the commands I am currently using is "hashcat64.exe -m 11600 -a 3 hast.txt" but I assume that is basically the same as all CAP, lower case, numbers and special characters.

I tried to use only lower case + numbers without wanting upper or special chars and command looks like "hashcat64.exe -m 11600 -a 3 -1 ?l?d hast.txt".  when I did that it says I specified a char set so I need a mask? how to do it without a mask as i use -a 3 means brute force with just lower case + number is what I want.

please help!