↩ 🔵 🔵 🔵 ❪✺₀❫ Language Concepts ○ C ○˒ ❪✺❫ C++ Concepts ○ ❪✺₁❫ C Classes ○ ❪✺₃❫ C Particulars ○ ❪✺₄❫ C Sets ○ ❪✺_❫ C Subs ○