There is a mute who wants to buy a toothbrush. By imitating the action of brushing 
one's teeth, he successfully expresses himself to the shopkeeper and the purchase 
is done. 
<p>Now if there is a blind man who wishes to buy a pair of sunglasses, how should 
  he express himself? </p>
He opens his mouth and says, &quot;I would like to buy a pair of sunglasses&quot;.
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