You have 20 minutes to a write a syntactically correct program in C# that will create all the possible letter/word combinations of a telephone key pad for a 7 digit number. You are not allowed to use a pen and paper. You are not allowed to use Visual Studio, but an editor we provide, however it must work correctly when we run it in Visual Studio. Both interviewers watching me and making notes. Interview question was not prepared but hastily typed up by tech lead who had a poor grasp of written English, I had to help him correct his question several times. The editor they gave me was poor and had its own learning curve which I doubt they scoped in. A decent question ruined by ill thought and pointless caveats.