My initial suggestion would be to run something like
hashcat -a 3 -1 ?l?u?d ?1?1?1?1?1?1?1 --stdout > m3200candidates.txt
and then use grep to output all those that does not contain only numbers or only letters. I'm not strong with grep, though, so not sure exactly how to do it....
Maybe something like
hashcat -a 3 -1 ?l?u?d ?1?1?1?1?1?1?1 --stdout | grep -v [a-zA-Z]{7} | grep -v [0-9]{7} > m3200candidates.txt
hashcat -a 3 -1 ?l?u?d ?1?1?1?1?1?1?1 --stdout > m3200candidates.txt
and then use grep to output all those that does not contain only numbers or only letters. I'm not strong with grep, though, so not sure exactly how to do it....
Maybe something like
hashcat -a 3 -1 ?l?u?d ?1?1?1?1?1?1?1 --stdout | grep -v [a-zA-Z]{7} | grep -v [0-9]{7} > m3200candidates.txt