Find a random word in the /usr/share/dict/words directory that is composed of 1 to 10 alphanumeric characters followed by 2 to 20 alphanumeric characters and print it to the terminal.
grep -rlE '^[a-zA-Z0-9]{1,10}\s[a-zA-Z0-9]{2,20}' /usr/share/dict/words | xargs -n1 | shuf | head -n1