Drop C( C G C F)

Intro:

F---------------------------------------------------------------------
C---7-7-7/-8-8-8-8-8/7-7-7-7-7h8/8-8-8-8-8h9--------------------------------------------
G-5--5-5-5/6-6-6-6-6/5-5-5-5-5-5/-6-6-6-6-6-6----------------------------------------------
C---------5----------5----------5------------5----------------------------

Main Riff:
[ Tab from: https://www.guitartabs.cc/tabs/s/system_of_a_down/toxicity_btab.html ]
F----------------------------------------------------------------------
C----------------------------------------------------------------------
G----------------------------------------------------------------------
C--0------032--------8-8-8-8-8-8-8/7-7-7-7-7-----0--032--8-8-8-8-8-8/7-7-7-7-7

F------------------------------------------------------------------------
C--------------------------------------------------------------------------
G-----------------------------------------------------------------------------
C--032032032032032032032032032032---8-8-8-8-8-/7-7-7-7-7--------------------------


If you're smart figure out the rest. If youre not too bad sucker
:) 

Order:

Intro
Main RiffX2
Verse( same as Intro)( you figure out how many times)
Main Riff( same thing as what i just said about how many times)
Verse( same)
Main Riff