Black Flag - Retired At 21 Chords & Tabs

i couldn't find a tab for this song so i thought i'd have a go at it. i don't think the
is 100% right but i think the riff from the verse is pretty similar to what i've tabbed.
not sure how to tab the pattern exactly but if u listen to the song you'll get it. i'm 
the chords are pretty similar to these.

standard tuning.
[ Tab from: https://www.guitartabs.cc/tabs/b/black_flag/retired_at_21_tab.html ]
the intro is played x2 and on the 2nd time you play the last progression (10, 12, 12,
12, 12, 10) four times.
intro
e-------------------------------------------------------------|
B-------------------------------------------------------------|
G------6---------8----------9----------11---------------------|
D-----7---7-----9---9-----10---10----12---12------------------|
A----7-----7---9-----9---10-----10--12-----12-----------------|
E---5-------5-7-------7-8--------8-10-------10----------------|

the chorus is the exactly same as the intro except it's played x4 instead of x2.
verse
e--------------------------------------------------------------|
B--------------------------------------------------------------|
G--------------------------------------------------------------|
D---7777--55---55 13 12-----7777--55--555-35-------------------|
A---7777--55---55 13 12-----7777--55--555-35-------------------|
E---5555--33---33 11 10-----5555--33--333-13-------------------|

hope u enjoy it. it's an awesome song 2 play.

tabbed by abe.