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Total index                                              B50001
 Crude processing (capacity)                             B5610C
...
     Iron and steel products                             G3311A2      
+    3311,2
    Fabricated metal product                             G332         
+    332
    Machinery                                            G333         
+    333

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my $code = "GMF";

print "$code: $description_hash{$code}.\n";

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GMF: Manufacturing (NAICS).

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