↩ 🔵 🔵 🔵 ❪✺₄❫ Data Sets ○ ❪✺_❫ Data Subs ○ ❪✺_ₛₛ❫ Information Subsets ○ ❪✺_ₛₛ₀❫ Computer Subset Portals ○ ❪✺_ₜₛ❫ Data Typesets ○