Addendum to Lecture 10
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The reason that wlookin() was not functionning in the lecture was due to
undocumented behaviour of the match() function.

The '>' (and also '<') as the first character of the second arguement 
changed the match behaviour, and breaks the code.

I have changed the Example to use '-' and everything is fine again.

It didn't show up using lookin(), as lookin() uses member(), and member()
does not exhibit this behaviour.