Ninja: Weapon skills

[Wombat Woo]

I already know the current katana weapon skills, and their levels.

http://www.bwire.net/TMOG/attachment.php?s=&postid=15229

However what I don't know, except for Blade: Retsu, are which ones are multi-hit weapon skills.

Nin/Sam would probably be interesting if there was a four to five multi-hit weapon skill.