ra- raa rab rai ral ram ran rao rap rar ras rat rba rbb rbi rbl rbm rbn rbo rbp rbr rbs rbt ria rib rii ril rim rin rio rip rir ris rit rla rli rll rlm rln rlo rlp rlr rls rlt rma rmb rmi rml rmm rmn rmo rmp rmr rms rmt rna rnb rni rnm rnn rno rnp rnr rns rnt roa rob roi rol rom ron roo rop ror ros rot rpa rpb rpi rpl rpm rpn rpo rpp rpr rps rpt rra rrb rri rrl rrm rrn rrp rrr rrs rrt rsa rsb rsi rsl rsm rsn rso rsp rsr rss rst rta rtb rti rtl rtm rtn rto rtp rtr rts rtt saa sab sai sal sam san sao sap sar sas sat sba sbb sbi sbl sbm sbn sbo sbp sbr sbs sbt sia sib sii sil sim sin sio sip sir sis sit sla slb sli sll slm sln slo slp slr sls slt sma smb smi sml smm smn smo smp smr sms smt sna snb sni snl snm snn sno snp snr sns snt soa sob soi sol som son soo sop sor sos sot spa spb spi spl spm spn spo spp spr sps spt sr- sra srb sri srl srm srn sro srp srr srs srt ss- ssa ssb ssi ssl ssm ssn sso ssp ssr sss sst sta stb sti stl stm stn sto stp str sts stt taa tab tai tal tam tan tao tap tar tas tat tba tbb tbi tbl tbm tbn tbo tbp tbr tbs tbt tia tib tii til tim tin tio tip tir tis tit tla tli tll tlm tln tlo tlp tlr tls tlt tma tmb tmi tml tmm tmn tmo tmp tmr tms tmt tna tnb tni tnl tnm tnn tno tnp tnr tns tnt to- toa tob toi tol tom ton too top tor tos tot tpa tpb tpi tpl tpm tpn tpo tpp tpr tps tpt tra trb tri trl trm trn tro trp trr trs trt tsa tsb tsi tsl tsm tsn tso tsp tsr tss tst tta ttb tti ttl ttm ttn tto ttp ttr tts ttt