Thanks pal. What if I also wanted a 4th column for corresponding groups for each likelihood combination in the output. For example , which would then take values from this hash :-

my %group = (               # Hash table/dictionary for all the  group
+s
             'P'=> 'I_1',
             'Pl'=>'I_2',
             'P.P'=>'I_3',
             'P.Pl'=>'I_4',
             'Pl.P'=>'I_5',
             'Pl.Pl'=>'I_6',
             'P.P.P'=>'I_7',
             'P.P.Pl'=>'I_8',
             'P.Pl.P'=>'I_9',
             'P.Pl.Pl'=>'I_10',
             'Pl.P.P'=>'I_11',
             'Pl.P.Pl'=>'I_12',
             'Pl.Pl.P'=>'I_13',
             'Pl.Pl.Pl'=>'I_14',
             'E'=> 'II_15',
             'P.E'  => 'II_16',
             'Pl.E' => 'II_17',
             'P.P.E'=>'II_18',
             'P.Pl.E'=>'II_19',
             'Pl.P.E'=>'II_20',
             'Pl.Pl.E'=>'II_21',
             'E.P'=> 'III_22',
             'E.Pl'=>'III_23',
             'P.E.P'=>'III_24',
             'P.E.Pl'=>'III_25',
             'Pl.E.P'=>'III_26',
             'Pl.E.Pl'=>'III_27',
             'E.P.P'=>'III_28',
             'E.P.Pl'=>'III_29',
             'E.Pl.P'=>'III_30',
             'E.Pl.Pl'=>'III_31',
             'E.E'=>'IV_32',
             'P.E.E'=>'IV_33',
             'Pl.E.E'=>'IV_34',
             'E.P.E'=>'IV_35',
             'E.Pl.E'=>'IV_36',
             'E.E.P'=>'IV_37',
             'E.E.Pl'=>'IV_38',
             'E.E.E'=>'IV_39',
            );
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So if my third column "in the output" has value P.P.P, fourth column will have the group_id (taken from the "group" hash) as I_7, and so on.