Versions of same site with www, no www, ww, and w

[Chuck-Boom]

It's just come to light that a couple of our clients have both www. and no www versions of their site, with no 301 in place. That's all fine, we're (trying) to get them to sort it.

But, strangely, one of our clients not only has the www. and no www, but they also have ww., and w. - all showing their site as normal - the only difference being that the www. and no www are both PR 3 while all other versions are N/A.

Does anyone have any idea what's going on/if it's a problem?

Thanks very much

[OlegKorneitchouk]

They could have set those up just in case people make typos when trying to reach the www. version. I would set up 301's from all of them to either the www. version or non-www version (check to see which is a better backlink profile).