What are the five castes of the World State?

In Aldous Huxley's "Brave New World," the World State is structured into five castes: Alpha, Beta, Gamma, Delta, and Epsilon. Alphas are the highest caste, possessing leadership roles and intellectual capabilities, while Betas are skilled workers. Gammas and Deltas perform less complex tasks, with Gammas being slightly more privileged than Deltas. Epsilons occupy the lowest caste, designed for menial labor and conditioned to be submissive.