''Using or being used in pairs is a pervasive technique '' DonaldNoyes.DoingStuff.20121206
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We use things in pairs in multitudes of ways in the ProgrammingCulture. 

Do WeNeedExamples?

PeopleProjectsAndPatterns
* PairProgramming
** http://donaldr.noyes.com/c2/PairThings.htm
* This / That
** http://donaldr.noyes.com/c2/ThisThat.htm
* IdentifyInclude
* FocusAndInvent
* CollectAndOrganize
* Programming Artifacts 
** Procedure - Name / Parameters
** HashFunctions - Key / Hash

* ...

* '' NotBuiltInOneDay '' - Now / Some other time