9 10
A A A A @ D D D @ @
A A A A @ D D D E E
@ @ @ @ @ @ @ @ E E
B B A A @ @ @ @ E E
B B A A F F F F @ @
B B A A F F F F F G
@ @ @ @ F F F F G G
C C C C @ @ G G G G
C C C C @ @ G G G G