[Perlfect-search] setting $STEMCHARS for most accurate search results

[Rusty Wilson]

I have read the faq and the comments within conf.pl, but I'm still a little
confused by what $STEMCHARS is/does.

Would someone be willing to explain in a little more detail exatly what the
$STEMCHARS variable does, and what I should set that variable to if search
accuracy is my primary concern.

Thank you!
Rusty