my $data={};
my $file;
while(<>) {
  chomp;
  # Skip blank lines
  next if /^\s*$/;
  if (/^Header/) {
    $data->{$_}={};  # Create a new first-level hash.
    $file=$_;
    next;
  }
  if (/^([a-zA-Z0-9*/]{3}-\S{3})\s+/) {
    my $key=$1;
    if ($file) {
      # Check for duplicates.
      if (exists($data->{$file}->{$key})) {
        warn "Duplicate key $key in $file: $_\n";
        next;
      }
      $data->{$file}->{$key}=$_;
    }
    else {
      warn "Line found before a header line: $_\n";
    }
  } else {
    # Reject improper lines
    warn "Badly formatted line found, ignoring: $_\n";
  }
}