↩ 🔵 🔵 🔵 ❪✺₄❫ C Sets ○ ❪✺_❫ C Subs ○ ❪✺_ₛₛ₀❫ Language Subsets ○ ❪✺_ₛₛ❫ C++ Subsets ○ ❪✺_ₜₛ❫ C Typesets ○