Yes, this has been tested. And you would know this if you:
1) did a search for either bey and read the results of the search, OR
2) went to the phantom discussion thread and read it or did an inline search for duo, OR
3) went to the duo thread and did the same.
I realize you are relatively new to the WBO, so I will take this time to reemphasize a very important concept: Read before you post and search before you try to make a thread.
As to the reading part, please begin by going to your private messages and re-reading the welcome PM you received that has very important information about how these forums work - including what i have just repeated for you above.