Gets rid of a few more 404 URLs
Hoping to increase search ranking by pleasing the GOOG

Apparently, the GOOG prefers dashes rather than underscores in URLs:

> Consider using punctuation in your URLs. The URL http://www.example.com/green-
> dress.html is much more useful to us than
> http://www.example.com/greendress.html. We recommend that you use hyphens (-)
> instead of underscores (_) in your URLs.

- From https://support.google.com/webmasters/answer/76329?hl=en