■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■
■□
□■