Find the sum of the following expressions: 

\(\left( {\frac{2}{3} \times \frac{2}{3} - \frac{3}{5} \times \frac{3}{5} + \frac{5}{6} \times \frac{5}{6} - 2 \times \frac{2}{3} \times \frac{5}{6}} \right) \), \(\left( {\frac{2}{3} \times \frac{2}{3} - \frac{3}{5} \times \frac{3}{5} - \frac{5}{6} \times \frac{5}{6} + 2 \times \frac{3}{5} \times \frac{5}{6}} \right) \), \(\left( {\frac{2}{3} \times \frac{3}{5} + \frac{5}{6} \times \frac{2}{3} + \frac{3}{5} \times \frac{3}{5} - \frac{5}{6} \times \frac{5}{6}} \right) \)