Exactly as $Wrt but writes the token only into the table if it does
not already exist. Unique here means that both the token string as the
token code are used for comparison.
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c |
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token code as a name |
n |
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token code as a number |
s |
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string to be written to the token table.
If left unspecified the current match, or current token ($Ct)
is written.
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