Bandit - Going to Level 9

Goal

The password for the next level is stored in the file data.txt and is the only line of text that occurs only once

Getting the information

bandit8@melinda:~$ sort data.txt | uniq −c | sort −n | head
1 UsvVyFSfZZWbi6wgC7dAFyFuR6jQQUhR
10 0dJUVh7xSLq6OkSLaxUydzRBVVJlc78x
10 1JF4GVFmFLq7XT2mYPpCzEl2aT33zxfh
10 1i6J1JQ6VDg2GYSqsgiwS1R6roZyHcm3
10 1skumAfscp0ErVYbzrMJCZHUAWMMfhKu
10 2UmZXYEWthhcRCHiw4qPHN0ePpPsXH9K
10 2Z4BvJXnpENq3Joy2bVqGnwxjPfdChY7
10 3C3DzQV7zOmQzE7OQh5ODK2CRFUHgHbQ
10 3rpovhi1CyT7RUTunW30goGek5Q5Fu66
10 3z96iN7exS00f8VyOYIOeEueZOVn631B