Code:

$file='c:\dir\file.txt' 
$array=readfile($file) 
for each $item in $array
  if right($item,1)=',' and not instr($item,$empties)
    $empties=$emptied+$item
  endif
next
if $empties
  $empties=split(left($empties,-1),',')
endif
;now print array of empty IDs
for each $item in $empties
  ? 'ID = '+$item
next
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There are two types of vessels, submarines and targets.