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    perl -e 'print "1:$_" while <>; print "2:$_" while <>;'
    
  2. or download this
           delete-char (C-d)
                  Delete the character at  point.   If  point  is  at  the
                  beginning  of  the  line, there are no characters in the
                  line, and the last character  typed  was  not  bound  to
                  delete-char, then return EOF.