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# To ''delete'' an appearance of a sign is to replace it with an appearance of the empty string "".
 
# To ''delete'' an appearance of a sign is to replace it with an appearance of the empty string "".
# To ''erase'' an appearance of a sign is to replace it with an appearance of the blank symbol "&nbsp".
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# To ''erase'' an appearance of a sign is to replace it with an appearance of the blank symbol " ".
    
A ''token'' is a particular appearance of a sign.
 
A ''token'' is a particular appearance of a sign.
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