Help with customer query please

Hi,

I have a template that takes wordpress custom query, the custom query I would like to use is this one from the wordpress website:
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All Posts in a Category

The “Blog pages show at most” parameter in Settings > Reading can influence your results. To overcome this, add the ‘posts_per_page’ parameter. For example:

query_posts( array ( ‘category_name’ => ‘category-slug’, ‘posts_per_page’ => -1 ) );
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I do not understand how to put it together.
I tried to put my slug and category name as “slug=size52” and cat name as “size52-Tshirts” and 12 as the number of post per page.

like this:
query_posts( array ( ‘size52-Tshirtse’ => ‘slug=size52′, ’12’ => -1 ) );

The query does not work, what did I miss please?

Thank you,

Ben