How many versions of ASFXX are there?

[Larien]

I know there are a lot of versions of the Love ~Destiny/refrain/since 1999~ songs, too, but I was curious if there was a count of the versions of ASFXX, since - I feel, anyway - it's probably one of the songs that's evolved the most throughout Ayu's career. The one's I'm aware of are:

A Song for xx (From the album of the same name)
A Song for xx (MILLENIUM MIX)
A song for xx (Ferry Corsten Chilled Remix)

Are there others?