mahjong

i am not really familiar with mahjong. i prefer playing cards than that. but my father loves that game. he plays in our house every weekend with his friends. they play it for long hours - almost the whole day. they just have a break to eat lunch and dinner. my sister prepares food and get some fee. lol! i don't know which one of them usually wins but i noticed that they are really having fun playing it. i usually hear the words, "pong" and "chow".