rfb rfe rff rfi rfl rfm rfo rfp rfr rfs rfu rib rie rif rii ril rim rio rip rir ris rle rlf rli rll rlm rlo rlp rlr rls rlu rmb rme rmf rmi rml rmm rmo rmp rmr rms rob roe rof roi rol rom roo rop ror ros rou rpb rpe rpf rpi rpl rpm rpo rpp rpr rps rpu rrb rrf rri rrl rrm rrp rrr rrs rru rsb rse rsf rsi rsl rsm rso rsp rsr rss rsu rub rue ruf rui rum ruo rup rur rus ruu sbb sbe sbf sbi sbl sbm sbo sbp sbr sbs sbu se- seb see sef sei sel sem seo sep ser ses seu sfb sfe sff sfi sfl sfm sfo sfp sfr sfs sfu sib sie sif sii sil sim sio sip sir sis siu slb sle slf sli sll slm slo slp slr sls slu smb sme smf smi sml smm smo smp smr sms smu sob soe sof soi sol som soo sop sor sos sou spb spe spf spi spl spm spo spp spr sps spu sr- srb sre srf sri srl srm sro srp srr srs ss- ssb sse ssf ssi ssl ssm sso ssp ssr sss ssu sub sue suf sui sul sum suo sup sur sus suu ubb ube ubf ubi ubl ubo ubp ubr ubs ubu ueb uee uef uei uel uem uep uer ues ufe uff ufi ufl ufm ufo ufp ufr ufs ufu uib uie uif uii uil uim uio uip uir uis uiu ulb ule ulf uli ull ulm ulo ulp ulr uls ulu um- umb ume umf umi uml umm umo ump umr ums umu uob uoe uol uom uoo uop uor uos up- upb upe upf upi upm upo upp upr ups upu ur- urb ure urf uri url urm uro urp urr urs uru usb use usf usi usl usm uso usp usr uss usu uue uum uur uus uuu