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;author Benji Dial
;name Epson

period equ 10

scan_init equ the_end - (the_end - scan) % period + period

scan
  seq.i -period, scan_init
  jmp found

found_ret
  add.ab #period, scan
  seq.ab scan, scan
  jmp scan

  add.f scan_add, scan
  jmn.a scan, scan

clear
  mov the_end, - 1
  sub.ab #2, clear

  seq.ab #the_end - clear - (the_end - clear) % 2 + 3, clear
  jmp clear

  mov.ab #-1, clear
  jmp clear

scan_add
  dat 2, period + scan_init + 2

found
  mov bomb, >scan
  mov bomb + 1, @scan
  jmp found_ret, <scan

bomb
  spl 1
  jmp bomb

the_end