}\_\text{KSL} = {\bigcup\limits_{i < j}\left( {\text{N}\_\text{S}\text{L}_{i} \cap \text{N}\_\text{S}\text{L}_{j}} \right)}} \\ {\mspace{0000mu} - \left\{ {\left\{ {{\bigcup\limits_{i < j}\left( {\text{P}\_\text{S}\text{L}_{i} \cap \text{P}\_\text{S}\text{L}_{j}} \right)}} \right\}\mspace{0000mu} \cap \left\{ {{\bigcup\limits_{i < j}\left( {\text{N}\_\text{S}\text{L}_{i} \cap \text{N}\_\text{S}\text{L}_{j}} \right)}} \right\}} \right\}