You ask your system administrator to verify user compliance with the corporate policies on password strength, namely that all passwords will have at least one numeral, at least one letter, at least one special character and be 15 characters long. He comes to you with a set of compliance tests for use with an offline password cracker. They are designed to examine the following parameters of the password:

* they contain only numerals

* they contain only letters

* they contain only special characters

* they contain only letters and numerals

" they contain only letters and special characters

* they contain only numerals and special characters

Of the following, what is the benefit to using this set of tests?