start:
  ldr A, #0b00000001
  ldr A, #0b00000010
  ldr A, #0b00000100
  ldr A, #0b00001000
  ldr A, #0b00010000
  ldr A, #0b00100000
  ldr A, #0b01000000
  ldr A, #0b10000000
  ldr A, #0b10101010
  ldr A, #0b11001100
  ldr A, #0b11110000

  ldr A, #0
  
  ldr B, #0b00000001
  ldr B, #0b00000010
  ldr B, #0b00000100
  ldr B, #0b00001000
  ldr B, #0b00010000
  ldr B, #0b00100000
  ldr B, #0b01000000
  ldr B, #0b10000000
  ldr B, #0b10101010
  ldr B, #0b11001100
  ldr B, #0b11110000

  ldr B, #0
  
  ldr C, #0b00000001
  ldr C, #0b00000010
  ldr C, #0b00000100
  ldr C, #0b00001000
  ldr C, #0b00010000
  ldr C, #0b00100000
  ldr C, #0b01000000
  ldr C, #0b10000000
  ldr C, #0b10101010
  ldr C, #0b11001100
  ldr C, #0b11110000

  ldr C, #0
  
  ldr D, #0b00000001
  ldr D, #0b00000010
  ldr D, #0b00000100
  ldr D, #0b00001000
  ldr D, #0b00010000
  ldr D, #0b00100000
  ldr D, #0b01000000
  ldr D, #0b10000000
  ldr D, #0b10101010
  ldr D, #0b11001100
  ldr D, #0b11110000

  ldr D, #0

  hlt