reo rer res reu rfb rfc rfe rff rfl rfm rfn rfo rfr rfs rfu rlc rle rlf rll rlm rln rlo rlr rls rlu rmb rmc rme rmf rml rmm rmn rmo rmr rms rnb rnc rnm rnn rno rnr rns rnu rob roc roe rof rol rom ron roo ror ros rou rrb rrc rrf rrl rrm rrn rrr rrs rru rsb rsc rse rsf rsl rsm rsn rso rsr rss rsu rub ruc rue ruf rum run ruo rur rus ruu sbb sbc sbe sbf sbl sbm sbn sbo sbr sbs sbu scb scc sce scf scl scm scn sco scr scs scu se- seb sec see sef sel sem sen seo ser ses seu sfb sfc sfe sff sfl sfm sfn sfo sfr sfs sfu slb slc sle slf sll slm sln slo slr sls slu smb smc sme smf sml smm smn smo smr sms smu snb snc sne snf snl snm snn sno snr sns snu sob soc soe sof sol som son soo sor sos sou sr- srb src sre srf srl srm srn sro srr srs ss- ssb ssc sse ssf ssl ssm ssn sso ssr sss ssu sub suc sue suf sul sum sun suo sur sus suu ubb ubc ube ubf ubl ubn ubo ubr ubs ubu ucb ucc uce ucf ucl ucm ucn uco ucr ucs ucu ueb uec uee uef uel uem uen uer ues ufc ufe uff ufl ufm ufn ufo ufr ufs ufu ulb ulc ule ulf ull ulm uln ulo ulr uls ulu um- umb umc ume umf uml umm umn umo umr ums umu un- unb unc une unf unl unm unn uno unr uns unu uob uoc uoe uol uom uon uoo uor uos ur- urb urc ure urf url urm urn uro urr urs uru usb usc use usf usl usm usn uso usr uss usu uuc uue uum uun uur uus uuu