computers has been obliterated as per DMA57361's answer, it clearly was a meta tag.
We still have computer and pc, I think computer can be obliterated but we need to pay special attention to the questions in pc as they are personal and thus that tag could be used in the same way server is used...
explain has been obliterated in the same way, and mind-mapping-software has also been retagged to mind-mapping and an optional software-rec.
