nur nus nut nuu p-p paa pab pac pae pai pak pan pap par pas pat pau pba pbb pbc pbe pbi pbk pbn pbp pbr pbs pbt pbu pca pcb pcc pce pci pck pcn pcp pcr pcs pct pcu pea peb pec pee pei pek pen pep per pes pet peu pia pib pic pie pii pik pin pip pir pis pit piu pka pkb pkc pke pki pkn pkp pkr pks pkt pku pn- pna pnb pnc pne pni pnk pnn pnp pnr pns pnt pnu ppa ppb ppc ppe ppi ppk ppn ppp ppr pps ppt ppu pra prb prc pre pri prk prn prp prr prs prt pru ps- psa psb psc pse psi psk psn psp psr pss pst psu pt- pta ptb ptc pte pti ptk ptn ptp ptr pts ptt ptu pua pub puc pue pui puk pun pup pur pus put puu ra- raa rab rac rae rai rak ran rap rar ras rat rau rba rbb rbc rbe rbi rbk rbn rbp rbr rbs rbt rbu rca rcb rcc rce rci rcn rcp rcr rcs rct rcu re- rea reb rec ree rei rek ren rep rer res ret reu ria rib ric rie rii rik rin rip rir ris rit rkb rkc rke rkk rkp rks rkt rku rna rnb rnc rni rnn rnp rnr rns rnt rnu rpa rpb rpc rpe rpi rpk rpn rpp rpr rps rpt rpu rra rrb rrc rri rrk rrn rrp rrr rrs rrt rru rsa rsb rsc rse rsi rsk rsn rsp rsr rss rst rsu rta rtb rtc rte rti rtk rtn rtp rtr rts rtt rtu rua rub ruc rue rui ruk run rup rur rus rut ruu saa sab sac sae sai sak san sap sar sas sat sau sba sbb sbc sbe sbi sbk sbn sbp sbr sbs sbt sbu sca scb scc sce sci sck scn scp scr scs sct scu se- sea seb sec see sei sek sen sep ser ses set seu sia sib sic sie sii sik sin sip sir sis sit siu sk- ska skb skc ske ski skk skp skr sks skt sku sna snb snc sne sni snk snn snp snr sns snt snu spa spb spc spe spi spk spn spp spr sps spt spu sr- sra srb src sre sri srk srn srp srr srs srt ss- ssa ssb ssc sse ssi ssk ssn ssp ssr sss sst ssu sta stb stc ste sti stk stn stp str sts stt stu sua sub suc sue sui suk sun sup sur sus sut suu taa tab tac tae tai tak tan tap tar tas tat tau tba tbb tbc tbe tbi tbk tbn tbp tbr tbs tbt tbu tca tcb tcc tce tci tck tcn tcp tcr tcs tct tcu te- tea teb tec tee tei tek ten tep ter tes tet teu tia tib tic tie tii tik tin tip tir tis tit tiu tka tkb tkc tke tkk tkp tkr tks tkt tna tnb tnc tne tni tnk tnn tnp tnr tns tnt tpa tpb tpc tpe tpi tpk tpn tpp tpr tps tpt tpu tra trb trc tre tri trk trn trp trr trs trt tru tsa tsb tsc tse tsi tsk tsn tsp tsr tss tst tsu tta ttb ttc tte tti ttk ttn ttp ttr tts ttt ttu tua tub tuc tue tui tuk tun tup tur tus tut tuu ua- uaa uab uac uae uai uak uan uap uar uas uat uau uba ubb ubc ube ubi ubk ubn ubp ubr ubs ubt ubu uca ucb ucc uce uci uck ucn ucp ucr ucs uct ucu uea ueb uec uee uei uen uep uer ues uet uia uib uic uie uii uin uip uir uis uit uiu uka ukb ukc uke uki ukk ukn ukp ukr uku un- una unb unc une uni unk unn unp unr uns unt unu up- upa upb upc upe upi upk upn upp upr ups upt upu ur- ura urb urc ure uri urk urn urp urr urs urt uru usa usb usc use usi usk usn usp usr uss ust usu uta utb utc ute uti utk utn utp utr uts utt utu uua uuc uue uun uur uus uut uuu