one user name, multiple passwords with .htaccess?

[g8z]

I'm trying to set up my .htaccess authentication so that I have one user name, but multiple passwords associated with that user name. How would I do this using .htaccess? E.g. my .htpasswd file looks like:

user:Encrypted_Password_1
user:Encrypted_Password_2

etc.
I tried this, but the system matches just the first line, so Encrypted_Password_2 doesn't work.

Thanks for your help.