Green Hell

One of the riffs is just doing a lot of 3`s on the (E) 
string,like below. The timing is something like 
16th notes. 
 
(G)|---------------------------------------------| 
(D)|---------------------------------------------| 
(A)|---------------------------------------------| 
(E)|-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-| 
 
Another riff in there is this, the main one.... 
 
(G)|----------------------------| 
(D)|------------------------1---| 
(A)|----------------------1---3-| 
(E)|-3-3-3-3-3-3-3-3----3-------| 
 
The last riff is this, used in the chorus, 
"green hell, green hell" part. 
 
(G)|---------------------------------| 
(D)|---------------------------------| 
(A)|---------------------------------| 
(E)|-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-| 
 
(G)|---------------------------------| 
(D)|---------------------------------| 
(A)|---------------------------------| 
(E)|-0-0-0-0-0-0-0-0-0-0-0-0-0-0-0-0-| 
 
After one of the chorus`s (either the 1st or 2nd time, 
I`m not sure), there is a little fill that goes 
something like the little riff below. 
 
(G)|--------------------| 
(D)|------7-------------| 
(A)|-5-7----7-5---------| 
(E)|--------------7-6-5-|