A concordance looks something like this:
It's a concordance of all the occurrences of wherefore in 8 text files of Romeo and Juliet. There are only 3 entries. The first one comes 644 words (43%) into a text file called rom06.txt.
Page url: http://www.lexically.net/wordsmith/step_by_step_Macedonian/?_overviewofconcord.htm