↩ 🔵 🔵 🔵 ❪✺₄❫ Network Sets ○ ❪✺_❫ Network Subs ○ ❪✺_ₛₛ❫ Graph Subsets ○ ❪✺_ₛₛ❫ System Subsets ○ ❪✺_ₛₛᵢ❫ Internet Subsets ○