use feature qw(state);

sub st3_look {
   my $cells = shift;
   state $points_str = [ map { join ':', @{$_} } @points ];
   for my $p (@{ $points_str }) {
      exists $cells->{$p} or die;
   }
   exists $cells->{'notfound'} and die;
   exists $cells->{'notfound2'} and die;
   exists $cells->{'notfound3'} and die;
}