timethese 200000, {
   Big => sub { big_look($big_ref) }, # $cells->{ ($p->[1] << 32) | ($p->[0] & 0xFFFFFFFF) }
   Kgb => sub { kgb_look($kgb_ref) }, # $cells->{ $str } # optimized
   Lan => sub { lan_look($lan_ref) }, # $cells->{ "@$p" }
   Mat => sub { mat_look($mat_ref) }, # $cells->{ $_->[0] }{ $_->[1] }
   Pak => sub { pak_look($pak_ref) }, # $cells->{ pack "ii", $p->[0], $p->[1] }
   St2 => sub { st2_look($st2_ref) }, # $cells->{ join(':', @$p) }
   St3 => sub { st3_look($st3_ref) }, # $cells->{ $str } # optimized
   Str => sub { str_look($str_ref) }, # $cells->{ $p->[0] .':'. $p->[1] }
};