+   +---+---+---+---+---+---+   +---+
|a  |a   g  |f   i   e  |e  |c   a  |g  
+---+---+   +   +---+---+---+---+   +
|e  |g  |g   h  |c   i  |j  |f  |h  |j  
+   +   +---+---+---+   +   +---+---+
 h   g   j   i  |h  |b   j  |i  |c  |i  
+   +---+---+---+---+---+---+---+   +
 i  |i  |h  |d  |g   i   b   c  |d   a  
+   +---+   +---+---+---+---+   +---+
|g  |c  |i  |i  |c   i  |e  |i   d  |c  
+   +   +---+   +---+---+   +---+   +
|b  |i  |g  |b  |j   f   f   f  |d  |g  
+---+   +   +---+---+   +   +   +   +
 i  |d  |g   e  |g  |d   d   b  |a  |d  
+---+---+---+---+---+---+   +---+   +
|h  |g   i  |b   j  |h  |f   i  |c  |b  
+---+---+   +   +   +---+---+   +   +
|a  |c   e  |e   j  |h   a  |h   j   g  
+---+---+---+   +---+   +   +---+   +
 e   j   a   i   b   h   h   b   f   g