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#!/usr/bin/perl -w

...
) {
    print "I don't know why this is printing.\n";
}

if (grep {$key eq $_} qw(ID TITLE GENE CYTOBAND LOCUSLINK CHROMOSOME S
+COUNT)) {
  print "This didn't print, did it?\n";
}

if (exists $is_valid{$key}) {
  print "Key '$key' is a valid key\n";
}