# File Automaten.rb, line 74
        def rueck_lesen(symb)
          str = getItem.reverse
                ind = str.index('.')
                substring = str[ind+2..(str.length-1)]
                ch = substring.split[0]
                return nil if ((substring[0,1]=='>') or (ch.reverse!=symb.to_s))
                return Item.new((" "+ch+". "+substring[(ch.length+1)..substring.length-1]).reverse,@rechtskontext) if ind==0
                return Item.new((str[0..ind-1]+" "+ch+". "+substring[(ch.length+1)..substring.length-1]).reverse,@rechtskontext)
        end