[exim] second condition in plaintext AUTH

I've searched the archives and the FAQs and haven't found what works yet for
my needs. what i need is a second login statement in the plain-text authentication
section.

existing code:

#per http://mirror.olnevhost.net/pub/exim/exim-html-4.40/doc/html/spec_34.html

 fixed_login:
    driver = plaintext
    public_name = LOGIN
    server_prompts = User Name : Password
    server_condition = \
      ${if and {{eq{$1}{username1}}{eq{$2}{password1}}}{yes}{no}}
    server_set_id = $1

...and I need to add a second username and password.    thanks in advance.