In a word list, a key word list or a list of collocates you may want to store several entries together: e.g. want; wants; wanting; wanted. Bringing them together means you're treating them as members of the same "lemma" or set -- rather like a headword in a dictionary.
A lemmatised head entry has a red mark in the left margin beside it. The others you marked will be coloured as if deleted. The linked entries which have been joined to the head can be seen at the right.
Here we see a word list based on 3-word clusters where originally a good deal had a frequency of 24, but has been joined to a great deal and a good few and thereby risen to 141.
Joining can be done automatically or manually.
How to do it
The menu offers choices for joining and un-joining.
View all the various lemma forms
Double-click on the Lemmas column as in the shot below,
and a window of Lemma Forms will open up, showing the various components.
Get rid of the deleted words If you don't want to see the deleted words
choose Ctrl-Z to zap them.
When you join or un-join words the number of text files for a given entry becomes unknown and you'll see 0 in the Texts column of a word list as in the case of BE above. (This is because although WordList does know how many texts each of the lemma variants occurs in, it doesn't know how many overlap.) To determine how many belong to the whole set, choose Check consistency.
To do it, WordList needs to be supplied with the name of a suitable index file based on the same texts.
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See also: Auto-Joining methods, Using a text file to lemmatise, selecting multiple entries, Concord lemmatisation