_UNIQUEWORDS — Returns the number of unique words in the last file processed by WORDS.

Syntax:
%_UNIQUEWORDS

Counting unique words requires WORDS to build a vocabulary list for each file. If you disable this step with /U:0 or /U:2, the list will not be available and this variable will return the value N/A.

Words that differ only in case are counted as the same word. In the phrase polish Polish furniture using Polish furniture polish, this plugin will find only three ‘unique’ words.

If the WORDS command has not been called, or if there was any error reading the last file, this variable returns the value N/A.