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    while (my $r=$stmt->fetch) {
        $str .= sprintf "%s^",join'~',@$r;
    }
    return $str;
}
sub newop {
    my ( $self, $owner, $left, $right ) = @_;
    return $left < $right;
}
__END__
"a disjunction of conjunctions of literals, where each literal is an elementary relational formula or its negation"