"After what becomes available?" ...After a PC becomes available. This information, although unneeded, can be ascertained by reading the sentence which you quote. Study sentence structure. The last noun used before the word "one" and that is relevant to it is "PC". Basic structure. Although 100% of the sentences I've written today are not he magically perfect, the quote you have pasted there IS grammatically correct, and would be, although understood, perhaps asked about in 1st grade in order to attempt to have the children memorize those words and hyphenated terms that are used during — Raven 51 secs ago