↩ 🔵 🔵 🔵 ❪✺₁.❫⁺ Classes of Sets ○ Space ○꠹ Address Space ○꠹ Color Space ○꠹ Column Space ○ Namespace ○꠹ Null Space ○꠹ Parameter Space ○꠹ Row Space ○ Vector Space ○꠹