10 10
A A A A A A A A A A
A A A A A A A A A A
A A A A A A A A A A
A A A A A A A A A A
A A A A A A A A A A
A A A A A A A A A A
A A A A A A A A A A
A A A A A A A A A A
A A A A A A A A A A
A A A A A A A A A A