my %parameters = (
    lastname       => [ qw( U a ) ],
    firstname      => [ qw( U a ) ],
    cno            => [ qw( U n ) ],
    unit           => [ qw( U s ) ],
    ward           => [ qw( U n ) ],
    dateadmission  => [ qw( D a ) ],
    datebirth      => [ qw( D a ) ],
  );