a ( B R R)
b
x (B B R)
y (R B R)
z (B B B)
z'(B R B)
palaweniya "a" awasthawedhi nam kelinma Black kiyanawa,,,, rathu dekaine thiyenne ethakota anith aya dannawa eyalage athe thiyena pata Red kiyala
palaweniya "b" awasthawedhi mukuth kiyanne naa,,, ethkota anith denna dannawa...