The most difficult counting problem I have so far is the sheep counting problem
The counter for animals is 匹（ひき）, but sometime it is also pronounced as びき, or even ぴき.... could someone tell me which is which? (I just know the first one is 一匹（いっぴき）).
I'm gonna kill the sheeps before I fall intso asleep...........
I read the wiki link that KyleGoetz has posted - only 3, 100, 1,000 and 10,000 and 何are using the p-sound. It seems so random to me.