Hi , I have following a record file like this:

Customer ID:    1711
        * * * No record * * *
Customer ID:    842
        Product ID:     716
        Category:A
        Product ID:     1523
        Category:C
        Product ID:     753
        Category:D
        Product ID:     76
Customer ID:    9306
        Product ID:     152
        Category:B
        Product ID:     34762
        Category:D
        Product ID:     1956
        Category:D
Customer ID:    24727
        Product ID:     15225
        Category:A
        Product ID:     9615
        Category:D
Customer ID:    46917
        Product ID:     20401
        Category:A
        Product ID:     9828
        Category:B
        Product ID:     665
        Category:C
        Product ID:     461
        Category:D
        Product ID:     1335
Customer ID:    50
        Product ID:     19554
        Category:A
        Product ID:     4309
        Category:C
__________________________________________________________

What I want output is:

Cust    Prod    Cata
1711    
842     1523    C
9306    152     B               
24727   15225   A
46917   9828    B
50      4309    C

For each customer, I only select one product based on an order of B, C, A,
D.

I thought I might use some kind of data structure like AOA or HOH, but don't
know how. Can anyone give me a help to use perl to handle this case?

Thank you in advance! 

Shiping

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