watch these. you might know more about the blood type.. hehh those kids are quite funny xD ehh but sorry, they are in mandarin ~(@^_^@)~
start from 8:26 of first video until 4:41 of third video. you can also watch from the beginning if you want [so funny the whole program] O(∩_∩)O
just a reference for you..
so understand already now??! hhaaa...