Dear list members

I have a data file which with variables personcni and Involvement Type and the file is structured as follows:

Sample dummy data:

PersonCNI                  InvolvementType
123                           VICTIM            
330                        VICTIM            
330                        PERSON OF INTEREST
330                        PERSON OF INTEREST
451                        PERSON OF INTEREST
555                        PERSON OF INTEREST
555                        PERSON OF INTEREST
666                        PERSON OF INTEREST
777                        PERSON OF INTEREST
777                        PERSON OF INTEREST
888                        PERSON OF INTEREST
888                        VICTIM            
888                        VICTIM            
888                        VICTIM            
888                        VICTIM            
888                        VICTIM            
9999                        VICTIM            
9999                              VICTIM            
9999                              PERSON OF INTEREST
9999                            VICTIM            

How do I select records where the person is a

a)        victim only
b)        POI only
c)        Both a victim and poi

In the first instance i am keeping it very simple with just these two variables without taking into account any date variables. All involvements were over 1 year period.  

I would be grateful if somebody could help select these records.

many thanks regards
thara

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