[ownedbycats]

Thanks

New question.

program:

	if
		list_count($#fanficcat, ',') == 3
		&& 'Crossover' in $#fanficcat 
		&&	
		('Mass Effect Trilogy' in $#fanficcat && 'Mass Effect: Andromeda' in $#fanficcat)
		|| 
		('Half-Life' in $#fanficcat && 'Portal' in $#fanficcat)
		then
			'yes'
		fi

Three checks:

1. There are three items in the taglike #fanficcat.
2. One of them is 'Crossover.'
3. The other two are either "Mass Effect Trilogy, Mass Effect Andromeda" or "Half-Life, Portal."

Examples, to make it more clear:

Spoiler:

"Half-Life, Portal" - ✘ no match
"Crossover, Half-Life, Mass Effect Trilogy" - ✘ no match
"Crossover, Half-Life, Portal, zzz" - ✘ no match
"Crossover, Half-Life, Portal" - ✔ 'yes'

However, I messed up the operators as I'm getting 'yes' on a book where #fanficcat is "Half-Life, Portal" (two items and it does not include crossover). Where did I make the mistake?