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Actually, this XKCD doesn’t apply. It’s really the opposite case. I can’t figure out what cat should replace here.
There’s always an xkcd
I didn’t mean to type those six words. I meant cat.
The only sane conclusion
Cat cat in cat cat cat.
As a unix shell script:
(cat ‘cat’) in (cat ‘cat’ ‘cat’)
Which should evaluate to true, because ‘cat’ can be found in ‘catcat’.