As a guideline for future libraries I would like to have some agreed list of common pairs of identifiers. This can be useful both for designing function names and for easy guessing of the counterpart of some function. E.g. I think the names 'read' and 'show' aren't a good choice because they are a natural pair but this isn't reflected by their names. Even more 'read' and 'show' sound like some I/O operations which they are not. The choice for the Modula-3 libraries (Lex and Fmt) seems to be more suitable. I've collected some pairs of identifiers I stumbled on in AmigaOS, MUI, Modula-3, Haskell libraries, and C++ STL. This could be a basis for further discussion. I could also make a HaWiki page of this list to simplify the discussion. It would be nice if one could throw out some of the duplicates. Create Delete New Dispose Construct Destruct Alloc Free Obtain Release Attempt Lock UnLock Procure Vacate Forbid Permit Disable Enable Put Get Set Get Write Read Poke Peek Open Close Save Load Load UnLoad Init Exit Setup Cleanup Show Hide Insert Remove Add Rem Push Pull Push Pop Start Stop Size Begin End Length First Last Number Head Tail Front Back Top Bottom Fmt Lex Input Output