I once knew three kata for the sai, Hama higa no sai, Chatan Yara no sai, and Tsukenshitahaku no sai. I forgot them over a 15 year period. Now that I'm "blowing off the dust" of these three, It seems that they are very simular to each other to the point of thinking that they are different versions of one kata. Your thoughts on this, Please....