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Chord diagram for Cm
Chord diagram for Bb
Chord diagram for Ab
Chord diagram for Gm
Chord diagram for Dm
Chord diagram for F
Chord diagram for Em6
Chord diagram for Em7
Chord diagram for Am
Chord diagram for A7
Chord diagram for D7
Chord diagram for E6
Chord diagram for E7
      Hey,
These are the chords I use when I play this one. 
Don't know if they are exactly what Thom plays, but they work for me.

Chords used:
Cm: x35543
A#: 688766
G#: 466544
Gm: 355333 or x10033
Dm/F: 10023x
Em6: 022020
Em7: 022030
Am: x02210
A7: x02020
Dm: xx0231
D7: xx0212 or x30232


[Intro]

Cm - A# - G#
Gm - Dm/F - E6 - E7


[Verse]

  Cm   A#     G#
I want you to know
     Gm  Dm/F   Em6    Em7
He's not coming back
Cm     A#    G#
Look into my eyes
    Gm  Dm/F   Em6    Em7
I'm not coming back


[Chorus]

   Am     A7
So knives out
Dm        D7
Catch the mouse
Gm
Don't look down
         Dm/F    Em6     Em7
Shove it in your mouth


[Verse]

   Cm    A#     G#
If you'd been a dog
              Gm      Dm/F   Em6    Em7
They would've drowned you at birth
Cm     A#    G#
Look into my eyes
         Gm                       Dm/F        Em6    Em7
It's the only way you'll know I'm telling the truth


[Chorus]

   Am     A7
So knives out
Dm       D7
Cook him up
Gm
Squash his head
        Dm/F   Em6    Em7
Put him in the pot


[Instrumental]

Cm - A# - G#
Gm - Dm/F - Em6 - Em7


[Verse]

  Cm   A#     G#
I want you to know
     Gm  Dm/F   Em6    Em7
He's not coming back
     Cm  A#      G#
He's bloated and frozen
Gm                        Dm/F             Em6    Em7
Still there's no point in letting it go to waste


[Chorus]

   Am     A7
So knives out
Dm        D7
Catch the mouse
Gm
Squash his head
        Dm/F   Em6    Em7
Put him in the pot

End in Em6

That's all
    

Source: https://tabs.ultimate-guitar.com/tab/radiohead/knives_out_chords_720566

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