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From Tekkenpedia

Poison Sword Spin
Command	1+2+3+4~b,f,u,d+1+4
Stance
Damage	1
Hit Range	!
Properties	CF
Move Frames		Hit Advantage
{{{Frames}}}		{{{Hit}}}
Block Advantage		CH Advantage
{{{Block}}}		{{{CH}}}

Poison Sword Spin is a secret move for Yoshimitsu introduced in Tekken 5. Yoshimitsu will "Supercharge" himself. Then, Yoshimitsu will spin his sword around in his hand while spitting purple noxious breath at his opponent. Like many secret moves, Poison Sword Spin is fairly difficult to input correctly. For this reason and because merely 1 damage is dealt to the opponent, this move is rarely seen performed.