Are you writing the result into a widget?
If you had a rich text field named "foo" which contained some of the words defined in the table for contextualize[], you'd apply it to the field something like this:
foo.value:contextualize[foo.value]
- reading "foo.value" produces a rich text table.
- "contextualize[foo.value] " calls the contextualize function with that rich text table and returns a modified rich text table.
- the colon (:) is the assignment operator in Lil.