Burzum - Feeble Screams From Forests Unknown Tabs

These are just the Riffs, with no timing, just listen to the song
and figure it out yourself.
I'm not sure about Riff 6 which starts at 2:37, so maybe somebody
can help me!

Riff 1

e|-------------------------|
B|-------------------------|
G|---*-*-*-*-*-*----*------|
D|--121212121212---12999999|
A|--101010101010---10777777|
E|8--------------8---------|

Riff 2

e|---------------------------|---------------------------|
B|---------------------------|---------------------------|
G|---------------------------|---------------------------|
D|7-7-7-8-7--5-4-710-7--8--54|7-7-7-8-7--5-4-710-9--8--3-|
A|5-5-5-6-5--3-2-5-8-7--6--32|5-5-5-6-5--3-2-5-8-7--6--1-|
E|---------------------------|---------------------------|

Riff 3

e|------------------------|
B|------------------------|
G|------------------------|
D|--------1010101010101010|
A|555588881010101010101010|
E|33336666-8-8-8-8-8-8-8-8|

Riff 4

e|------------------------------------------|
B|------------------------------------------|
G|------------------------------------------|
D|8-8-89-108-8-89-108-8-87-66-6-67-86-6-67-8|
A|8-8-89-108-8-89-108-8-87-66-6-67-86-6-67-8|
E|------------------------------------------|

Riff 5

e|-----------------------------------|
B|--------------*--------------------|
G|8-8-8--------1010/9-9-99-9/5-5-55-5|      * : 1010
D|8-8-88-81010-1010/9-9-99-9/5-5-55-5|          1010
A|6-6-68-6-8-8-88-8/7-7-77-7/3-3-33-3|           8 8
E|-----6-----------------------------|

Riff 6

?

Riff 7

e|------------------|
B|------------------|
G|------------------|
D|5------4----------|
A|3------2----------|
E|------------------|


Riff 8

e|----------------|   the last time   e|-----------------|
B|----------------|   goes like       B|-----------------|
G|----------------|   this:           G|-----------------|
D|6666555555553333|                   D|66663333~--------| 
A|6666555555553333|                   A|66663333~--------|
E|4444333333331111|                   E|44441111~--------| 

Riff 9

e|------------------------|
B|------------------------|
G|555555555555------------|
D|555555555555444444444444|
A|333333333333444444444444|
E|------------222222222222|

Riff 10 

e|----------------|----------------||----------------|
B|----------------|----------------||----------------|
G|----7777----7777|----8888----8888||----------------|
D|5555555555555555|6666666666666666||----6666----6666|
A|3333----3333----|4444----4444----||4444444444444444|
E|----------------|----------------||2222----2222----|

Riff 11

e|--------------|
B|--------------|
G|-------6------|
D|3------4------|
A|1-------------|
E|--------------|