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  1. or download this
    push ( @{$map{$$row[1]}{$$row[2]}}, $$row[0] ) unless $map{$$row[1]}{$
+$row[2]}{$$row[0]}++;
  2. or download this
    push ( @{$map{$$row[1]}{$$row[2]}}, $$row[0] ) unless ${$map{$$row[1]}
+{$$row[2]}{$$row[0]}}++;
  3. or download this
    push ( @{$map{$$row[1]}{$$row[2]}}, $$row[0] ) unless grep { /$$row[0]
+/ } @{$map{$$row[1]}{$$row[2]}};