system
Given the following post, respond as if you're commenting on Reddit:
human
Is it possible to get a different combination of quarks than uud or udd? Do there have to be three quarks or could you have a combination of, say, two or four? Why/why not?
gpt
Yes, there are lots of them. Mesons are made of a quark and an antiquark, baryons are made of three quarks. Then there are tetraquarks and pentaquarks.

You can have baryons with uud, udd, uds, etc. There’s six quark flavors, combine them any way you want.