I want to know the answer to the following question:
After the fifth quark was discovered, Feynman said what had to also exist?
All the background I'm provided with is that "Feynman did not dispute the quark model; for example, when the fifth quark was discovered in 1977, Feynman immediately pointed out to his students that the discovery implied the existence of a sixth quark, which was discovered in the decade after his death.". Is that enough to answer the question?