nrr nrs nrt nsa nsc nse nsf nsg nsi nsn nso nsp nsr nss nst nta ntc nte ntf ntg nti ntn nto ntp ntr nts ntt o-i oaa oac oae oaf oag oai oan oao oap oar oas oat oc- oca occ ocf ocg oci ocn oco ocp ocr ocs oct oea oec oee oef oeg oei oen oeo oep oer oes oet of- ofa ofc ofe off ofg ofi ofn ofo ofp ofr ofs oft oga ogc oge ogf ogg ogi ogn ogo ogp ogs ogt oia oic oie oif oii oin oio oip oir ois oit on- ona onc one onf ong oni onn ono onp onr ons ont oo- ooa ooc oof oog ooi oon ooo oop oor oos oot op- opa opc ope opf opg opi opn opo opp opr ops opt or- ora orc ore orf org ori orn oro orp orr ors ort os- osa osc ose osf osg osi osn oso osp osr oss ost ot- ota otc ote otf otg oti otn oto otp otr ots ott p-p paa pac pae paf pag pai pan pao pap par pas pat pca pcc pce pcf pcg pci pcn pco pcp pcr pcs pct pea pec pee pef peg pei pen peo pep per pes pet pfa pfc pfe pff pfg pfi pfn pfo pfp pfr pfs pft pga pgc pge pgf pgg pgi pgn pgo pgp pgr pgs pgt pia pic pie pif pig pii pin pio pip pir pis pit pn- pna pnc pne pnf png pni pnn pno pnp pnr pns pnt poa poc poe pof pog poi pon poo pop por pos pot ppa ppc ppe ppf ppg ppi ppn ppo ppp ppr pps ppt pra prc pre prf prg pri prn pro prp prr prs prt ps- psa psc pse psf psg psi psn pso psp psr pss pst pt- pta ptc pte ptf ptg pti ptn pto ptp ptr pts ptt ra- raa rac rae raf rag rai ran rao rap rar ras rat rca rcc rce rcf rcg rci rcn rco rcp rcr rcs rct re- rea rec ree ref reg rei ren reo rep rer res ret rfa rfc rfe rff rfg rfi rfn rfo rfp rfr rfs rft rga rgc rge rgf rgg rgi rgn rgo rgp rgr rgs rgt ria ric rie rif rig rii rin rio rip rir ris rit rna rnc rng rni rnn rno rnp rnr rns rnt roa roc roe rof rog roi ron roo rop ror ros rot rpa rpc rpe rpf rpg rpi rpn rpo rpp rpr rps rpt rra rrc rrf rrg rri rrn rrp rrr rrs rrt rsa rsc rse rsf rsg rsi rsn rso rsp rsr rss rst rta rtc rte rtf rtg rti rtn rto rtp rtr rts rtt saa sac sae saf sag sai san sao sap sar sas sat sca scc sce scf scg sci scn sco scp scr scs sct se- sea sec see sef seg sei sen seo sep ser ses set sfa sfc sfe sff sfg sfi sfn sfo sfp sfr sfs sft sga sgc sge sgf sgg sgi sgn sgo sgp sgr sgs sgt sia sic sie sif sig sii sin sio sip sir sis sit sna snc sne snf sng sni snn sno snp snr sns snt soa soc soe sof sog soi son soo sop sor sos sot spa spc spe spf spg spi spn spo spp spr sps spt sr- sra src sre srf srg sri srn sro srp srr srs srt ss- ssa ssc sse ssf ssg ssi ssn sso ssp ssr sss sst sta stc ste stf stg sti stn sto stp str sts stt taa tac tae taf tag tai tan tao tap tar tas tat tca tcc tce tcf tcg tci tcn tco tcp tcr tcs tct te- tea tec tee tef teg tei ten teo tep ter tes tet tfa tfc tfe tff tfg tfi tfn tfo tfp tfr tfs tft tga tgc tge tgf tgg tgi tgn tgo tgp tgr tgs tgt tia tic tie tif tig tii tin tio tip tir tis tit tna tnc tne tnf tng tni tnn tno tnp tnr tns tnt to- toa toc toe tof tog toi ton too top tor tos tot tpa tpc tpe tpf tpg tpi tpn tpo tpp tpr tps tpt tra trc tre trf trg tri trn tro trp trr trs trt tsa tsc tse tsf tsg tsi tsn tso tsp tsr tss tst tta ttc tte ttf ttg tti ttn tto ttp ttr tts ttt