5 6 RGYYYG RRGGGG YYRRGG GGGRRR YYGGGG
Case 1: Red group R+++++ RR++++ ++RR++ +++RRR ++++++ Green group +G+++G ++GGGG ++++GG GGG+++ ++GGGG Yellow group ++YYY+ ++++++ YY++++ ++++++ YY++++