my $mset = $srch->mset($ctx->{query}, $ctx->{qopts});
my $size = $mset->size or return;
$ctx->{qopts}->{offset} += $size;
$ctx->{ids} = $srch->mset_to_artnums($mset, $ctx->{qopts});
my $mset = $srch->mset($ctx->{query}, $ctx->{qopts});
my $size = $mset->size or return;
$ctx->{qopts}->{offset} += $size;
$ctx->{ids} = $srch->mset_to_artnums($mset, $ctx->{qopts});