○ ○ ● ○ ○ ● ○ ○ ● ● ● ● ○ ○ ● ● ○ ○ ● ● ○ ● ○ ● ○ ○ ● ● ○ ○ ● ● ○ ● ○ ● ● ● ○ ● ● ○ ○ ● ● ● ● ○ ● ○ ● ○ ○ ● ● ○ ● ●