# $EPIC: diff.txt,v 1.2 2006/07/26 19:47:17 sthalik Exp $
$diff(<word list 1> / <word list 2>)
There must be a literal slash character ('/') that separates the two word lists. If it is omitted the empty string is returned.
It is not required to have spaces on either side of the slash, but it also does not hurt to have them.
The return value is a word list comprised of the negated set-difference of <word list 1> and <word list 2>, that is to say:
The return value is a word list of all words that are in ONE BUT NOT BOTH of the word lists.
All extra whitespace around words will be lost.
Double quoted words are honored, but the double quotes will be lost in the return value.
Use this function if you need to find the un-common elements of two
different word lists.
All words that are in either <word list 1> or <word list 2> but not both.
$diff(one two three / two three four) returns "one four"
$diff(one two / three four) returns "one two three four"