"l_from int(8) unsigned NOT NULL default '0', " .
"l_to int(8) unsigned NOT NULL default '0', " .
"UNIQUE KEY l_from(l_from,l_to), " .
"l_from int(8) unsigned NOT NULL default '0', " .
"l_to int(8) unsigned NOT NULL default '0', " .
"UNIQUE KEY l_from(l_from,l_to), " .