2 + 2 = 5 (The Lukewarm.)

Credits

• Colin Greenwood
  bass guitar, sampler, synthesizer
• Darrell Thorp
  engineer
• Ed O’Brien
  background vocals, effects, guitar
• Jonny Greenwood
  electronic instruments, glockenspiel, guitar, ondes Martenot, toy piano
• Nigel Godrich
  editor, mix, recording
• Philip Selway
  drums (drum set), percussion
• Thom Yorke
  guitar, piano, programming, vocal