my @priorities = qw(Organization FAQ Service);
my $prio_top = join "|", map { "^$_" } @priorities;
sub by_priority {
  # Return 0 on string identity
  return 0 if $a eq $b;

  return -1 if $a =~ /$prio_top/o;
  return  1 if $b =~ /$prio_top/o;

  # Alphabetical sort for the rest
  return $a cmp $b;
}