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DATA
...
32450045 ** N Jul 14               SN9672        AGEC685203   ATI     
+  S
36450223    N Aug 30               SU8329        AGEC685348   ATI     
+  S
34680135    N Sep 30               349450        AGEC685442   ATI     
+  S

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my %seen = ();
$seen{$_}++;
next if $seen{$_} > 1;
print;