Detective or gothic, under 300 pages: an any-of group

A shelf of quick, gripping reads: books tagged detective or gothic, but only the short ones.

The list

In the app this list is called Detective or horror, under 300 pages.

What it says

Take every Book. Keep the ones where any of (Genres includes Detective and mystery, Genres includes Horror and gothic) is true and Pages is less than 300. Sort by Pages, shortest first. No limit.

On the storefront

The top level of the conditions is all of. Add group puts an any of block inside it; the two genre conditions go in the group and the page count stays outside. A book passes if it satisfies at least one of the genre conditions and the page condition. Genres is a list reference, so includes means the referenced genre is somewhere in the list.

In your store

Any either-or inside an and: products in either of two categories that are also in stock; stockists in either county that offer collection. Groups nest as deep as you need, and each has its own all-of or any-of.