A [https://en.wiktionary.org/wiki/semordnilap#Noun semordnilap] is a word (or phrase) that spells a different word (or phrase) backward. "Semordnilap" is a word that itself is a semordnilap.

Example: ''lager'' and ''regal''
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;Task
This task does not consider semordnilap phrases, only single words.
Using only words from <u>[http://wiki.puzzlers.org/pub/wordlists/unixdict.txt this list]</u>, report the total number of unique semordnilap pairs, and print 5 examples.
Two matching semordnilaps, such as ''lager'' and ''regal'', should be counted as one unique pair.
(Note that the word "semordnilap" is not in the above dictionary.)


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