code: func StripGreasedVersions(versions []VersionNumber) []VersionNumber {
  	realVersions := make([]VersionNumber, 0, len(versions))
  	for _, v := range versions {
  		if v&0x0f0f0f0f != 0x0a0a0a0a {
  			realVersions = append(realVersions, v)
  		}
  	}
  	return realVersions
  }
docs: // StripGreasedVersions strips all greased versions from a slice of versions