Datasets:
| + +---+---+---+---+---+---+ +---+ | |
| |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 | |