# File lib/HebrewProber.rb, line 195
        def feed(aBuf)
            # Final letter analysis for logical-visual decision.
            # Look for evidence that the received buffer is either logical Hebrew or 
            # visual Hebrew.
            # The following cases are checked:
            # 1) A word longer than 1 letter, ending with a final letter. This is an 
            #    indication that the text is laid out "naturally" since the final letter 
            #    really appears at the end. +1 for logical score.
            # 2) A word longer than 1 letter, ending with a Non-Final letter. In normal
            #    Hebrew, words ending with Kaf, Mem, Nun, Pe or Tsadi, should not end with
            #    the Non-Final form of that letter. Exceptions to this rule are mentioned
            #    above in isNonFinal(). This is an indication that the text is laid out
            #    backwards. +1 for visual score
            # 3) A word longer than 1 letter, starting with a final letter. Final letters 
            #    should not appear at the beginning of a word. This is an indication that 
            #    the text is laid out backwards. +1 for visual score.
            # 
            # The visual score and logical score are accumulated throughout the text and 
            # are finally checked against each other in GetCharSetName().
            # No checking for final letters in the middle of words is done since that case
            # is not an indication for either Logical or Visual text.
            # 
            # We automatically filter out all 7-bit characters (replace them with spaces)
            # so the word boundary detection works properly. [MAP]

            if get_state() == :NotMe
                # Both model probers say it's not them. No reason to continue.
                return :NotMe
            end

            aBuf = filter_high_bit_only(aBuf)

            for cur in aBuf
                if cur == ' '
                    # We stand on a space - a word just ended
                    if @_mBeforePrev != ' '
                        # next-to-last char was not a space so @_mPrev is not a 1 letter word
                        if is_final(@_mPrev)
                            # case (1) [-2:not space][-1:final letter][cur:space]
                            @_mFinalCharLogicalScore += 1
                        elsif is_non_final(@_mPrev)
                            # case (2) [-2:not space][-1:Non-Final letter][cur:space]
                            @_mFinalCharVisualScore += 1
                        end
                    end
                else
                    # Not standing on a space
                    if (@_mBeforePrev == ' ') and (is_final(@_mPrev)) and (cur != ' ')
                        # case (3) [-2:space][-1:final letter][cur:not space]
                        @_mFinalCharVisualScore += 1
                    end
                end
                @_mBeforePrev = @_mPrev
                @_mPrev = cur
            end

            # Forever detecting, till the end or until both model probers return eNotMe (handled above)
            return :Detecting
        end