puu saa sab sac sad sai sam sao sap sas sat sau sba sbb sbc sbd sbi sbm sbo sbp sbs sbt sbu sca scb scc scd sci scm sco scp scs sct scu sda sdb sdc sdd sdi sdm sdo sdp sds sdt sdu sia sib sic sid sii sim sio sip sis sit siu sma smb smc smd smi smm smo smp sms smt smu soa sob soc sod soi som soo sop sos sot sou spa spb spc spd spi spm spo spp sps spt spu ss- ssa ssb ssc ssd ssi ssm sso ssp sss sst ssu sta stb stc std sti stm sto stp sts stt stu sua sub suc sud sui sum suo sup sus sut suu taa tab tac tad tai tam tao tap tas tat tau tba tbb tbc tbd tbi tbm tbo tbp tbs tbt tbu tca tcb tcc tcd tci tcm tco tcp tcs tct tcu tda tdb tdc tdd tdi tdm tdo tdp tds tdt tdu tia tib tic tid tii tim tio tip tis tit tiu tma tmb tmc tmd tmi tmm tmo tmp tms tmt tmu to- toa tob toc tod toi tom too top tos tot tou tpa tpb tpc tpd tpi tpm tpo tpp tps tpt tpu tsa tsb tsc tsd tsi tsm tso tsp tss tst tsu tta ttb ttc ttd tti ttm tto ttp tts ttt ttu tua tub tuc tud tui tum tuo tup tus tut tuu ua- uaa uab uac uad uai uam uao uap uas uat uau uba ubb ubc ubi ubo ubp ubs ubt ubu uca ucb ucc ucd uci ucm uco ucp ucs uct ucu uda udb udc udd udi udm udo udp uds udt udu uia uib uic uid uii uim uio uip uis uit uiu um- uma umb umc umd umi umm umo ump ums umt umu uoa uob uoc uod uom uoo uop uos uot up- upa upb upc upd upi upm upo upp ups upt upu usa usb usc usd usi usm uso usp uss ust usu uta utb utc utd uti utm uto utp uts utt utu uua uuc uum uus uut uuu