↩ 🔵 🔵 🔵 ❪✺₄❫ Statistical Sets ○ ❪✺_❫ Statistical Subs ○ ❪✺_ₛₛ❫ Mathematical Subsets ○ ❪✺_ₛₛ❫ Probabilistic Subsets ○ ❪✺_ₜₛ❫ Statistical Typesets ○