Display point with multiple attributes

[Taka Wong]

Dear All

I have a question about the attribute display on each pt. It may be a little bit 
complicated.

Now, there are 3 men, 
man 1 : red blue 
man 2 : red
man 3 : blue

According to my layer definition:

LAYER
  NAME MAN
  TYPE POINT
   ....
  CLASS
    ....
    EXPRESSION ('[LAYER1]' = 'R,B')
    SYMBOL 'symbols/label1.gif'
    ....
  END
  CLASS
    ....
    EXPRESSION ('[LAYER1]' = 'R')
    SYMBOL 'symbols/label2.gif'
    ....
  END
  CLASS
    ....
    EXPRESSION ('[LAYER1]' = 'B')
    SYMBOL 'symbols/label3.gif'
    ....
  END
  ....
END

If I search for men carrying red ball, it results 
Man 1's symbol is label1.gif
Man 2's symbol is label2.gif

However, I suppose that if I only search for red ball, all points' symbol would 
be label2.gif
i.e. Man 1's symbol is label2.gif
     Man 2's symbol is label2.gif


Similarly, if I search for men carrying blue ball, it is supposed to results 
Man 1's symbol is label3.gif
Man 3's symbol is label3.gif

And, if I search for men carrying blue ball or red, it is supposed to results 
Man 1's symbol is label1.gif
Man 2's symbol is label2.gif
Man 3's symbol is label3.gif

are there any person has experiensed such case before?
Please advice me. Thanks a lot.

Regards
Taka Wong