Enum query

[venerable bede]

If want to create an Enumeration where if I have the number 1,2 or 3 it is enum 1, 3,4 or 5 will be enum 2 and 6 will be enum 3 e.g(psuedo code):

Enum TestResult
  Pass  = 1,2 or 3
  Maybe = 4 or 5
  Screwed = 6
End Enum

or like 

Enum TestResult
  Pass  = 1,2,3
  Maybe = 4,5
  Screwed = 6
End Enum

How is this implemented?

Thansk In Advance