sra srb srd sre srg sri srl srm sro srp srr srs ss- ssa ssb ssd sse ssg ssi ssl ssm sso ssp ssr sss ssu sua sub sud sue sug sui sul sum suo sup sur sus suu ua- uaa uab uad uae uag uai ual uam uao uap uar uas uau uba ubb ube ubg ubi ubl ubo ubp ubr ubs ubu uda udb udd ude udg udi udl udm udo udp udr uds udu uea ueb ued uee ueg uei uel uem uep uer ues uga ugb uge ugg ugi ugl ugm ugo ugp ugr ugs ugu uia uib uid uie uig uii uil uim uio uip uir uis uiu ula ulb uld ule ulg uli ull ulm ulo ulp ulr uls ulu um- uma umb umd ume umg umi uml umm umo ump umr ums umu uoa uob uod uoe uog uol uom uoo uop uor uos up- upa upb upd upe upg upi upm upo upp upr ups upu ur- ura urb urd ure urg uri url urm uro urp urr urs uru usa usb usd use usg usi usl usm uso usp usr uss usu uua uue uug uum uur uus uuu