Basic Nikakudori

"Nikakudori" is a puzzle game to take the same patten of mahjong tiles irregularly lined up.

* Take away two tiles at each time. When all the tiles are out, the game is over!

* The condition to take the tiles are as blow:
- When the same kind of tiles are side by side.
- When two same kind of tiles can be connected within three horizontal or vertical lines.