[eschwartz]

I think in this case it makes a lot more sense to create a search, e.g.

Search name "Primary"

#magazine_title:"=New Scientist" or #magazine_title:"=PC Advisor" or #magazine_title:"=PC Magazine" or #magazine_title:"=PC Powerplay" or #magazine_title:"=PC Pro" or #magazine_title:"=PC World" or #magazine_title:"=Popular Science"

But you can achieve the effect you want with this template:
(change the three constants at the top to suit your needs)

program:

primary_listitems = 'New Scientist, PC Advisor, PC Magazine, PC Powerplay, PC Pro, PC World, Popular Science';
secondary_listitems = 'World';
title = '#magazine_title';


str_in_list(
    primary_listitems,
    ',',
    title,
    'primary',
    str_in_list(
        secondary_listitems,
        ',',
        title,
        'secodary',
        'other'
    )
);