[wolfrainvn]

LOL, I thought I would use the term “vacant” for "not occupied" and I use "THE" instead of "SOME" because I was preferring to all the computers in the room, that is why in the second clause of the same sentence, I used the preposition “except” to mark the exception of what I meant in the first clause of the sentence. Although, I am not sure about the appropriate use of “vacant” for “not occupied” in this case.