}\_\text{KSL} + \left\{ {\left\{ {{\bigcup\limits_{i = 0}^{0}{\text{N}\_\text{S}\text{L}_{i}}}} \right\}\mspace{0000mu} - \left\{ {\left( {{\bigcup\limits_{i = 0}^{0}{\text{P}\_\text{S}\text{L}_{i}}}} \right) \cap \left( {{\bigcup\limits_{i = 0}^{0}{\text{N}\_\text{S}\text{L}_{i}}}} \right)} \right\}} \right\}