If you specify a list of references from a new line, then the number of redirects will be equal to this list.
{RANDNUM-n}   - random characters of the numbers            where "n" - the number of characters
{RANDWORDS-n} - random characters of letters                eg 1: http://site.com/#{RANDNUM-10}
{RANDALL-n}   - random characters of numbers and letters    eg 2: http://{RANDWORDS-10}.site.com/