nrn nro nrp nrr nrs nrt nsa nsb nsd nse nsg nsi nsn nso nsp nsr nss nst nta ntb ntd nte ntg nti ntn nto ntp ntr nts ntt o-i oaa oab oad oae oag oai oan oao oap oar oas oat ob- oba obb obd obe obg obi obn obo obp obr obs obt oda odb odd ode odg odi odn odo odp odr ods odt oea oeb oed oee oeg oei oen oeo oep oer oes oet oga ogd oge ogg ogi ogn ogo ogp ogs ogt oia oib oid oie oii oin oio oip oir ois oit on- ona onb ond one ong oni onn ono onp onr ons ont oo- ooa oob ood oog ooi oon ooo oop oor oos oot op- opa opb opd ope opg opi opn opo opp opr ops opt or- ora orb ord ore org ori orn oro orp orr ors ort os- osa osb osd ose osg osi osn oso osp osr oss ost ot- ota otb otd ote otg oti otn oto otp otr ots ott p-p paa pab pad pae pag pai pan pao pap par pas pat pba pbb pbd pbe pbg pbi pbn pbo pbp pbr pbs pbt pda pdb pdd pde pdg pdi pdn pdo pdp pdr pds pdt pea peb ped pee peg pei pen peo pep per pes pet pga pgb pgd pge pgg pgi pgn pgo pgp pgr pgs pgt pia pib pid pie pig pii pin pio pip pir pis pit pn- pna pnb pnd pne png pni pnn pno pnp pnr pns pnt poa pob pod poe pog poi pon poo pop por pos pot ppa ppb ppd ppe ppg ppi ppn ppo ppp ppr pps ppt pra prb prd pre prg pri prn pro prp prr prs prt ps- psa psb psd pse psg psi psn pso psp psr pss pst pt- pta ptb ptd pte ptg pti ptn pto ptp ptr pts ptt ra- raa rab rad rae rag rai ran rao rap rar ras rat rba rbb rbd rbe rbg rbi rbn rbo rbp rbr rbs rbt rda rdb rdd rde rdg rdi rdn rdo rdp rdr rds rdt re- rea reb red ree reg rei ren reo rep rer res ret rga rgb rgd rge rgg rgi rgn rgo rgp rgr rgs rgt ria rib rid rie rig rii rin rio rip rir ris rit rna rnb rnd rng rni rnn rno rnp rnr rns rnt roa rob rod roe rog roi ron roo rop ror ros rot rpa rpb rpd rpe rpg rpi rpn rpo rpp rpr rps rpt rra rrb rrd rrg rri rrn rrp rrr rrs rrt rsa rsb rsd rse rsg rsi rsn rso rsp rsr rss rst rta rtb rtd rte rtg rti rtn rto rtp rtr rts rtt saa sab sad sae sag sai san sao sap sar sas sat sba sbb sbd sbe sbg sbi sbn sbo sbp sbr sbs sbt sda sdb sdd sde sdg sdi sdn sdo sdp sdr sds sdt se- sea seb sed see seg sei sen seo sep ser ses set sga sgb sgd sge sgg sgi sgn sgo sgp sgr sgs sgt sia sib sid sie sig sii sin sio sip sir sis sit sna snb snd sne sng sni snn sno snp snr sns snt soa sob sod soe sog soi son soo sop sor sos sot spa spb spd spe spg spi spn spo spp spr sps spt sr- sra srb srd sre srg sri srn sro srp srr srs srt ss- ssa ssb ssd sse ssg ssi ssn sso ssp ssr sss sst sta stb std ste stg sti stn sto stp str sts stt taa tab tad tae tag tai tan tao tap tar tas tat tba tbb tbd tbe tbg tbi tbn tbo tbp tbr tbs tbt tda tdb tdd tde tdg tdi tdn tdo tdp tdr tds tdt te- tea teb ted tee teg tei ten teo tep ter tes tet tga tgb tge tgg tgi tgn tgo tgp tgr tgs tgt tia tib tid tie tig tii tin tio tip tir tis tit tna tnb tnd tne tng tni tnn tno tnp tnr tns tnt to- toa tob tod toe tog toi ton too top tor tos tot tpa tpb tpd tpe tpg tpi tpn tpo tpp tpr tps tpt tra trb trd tre trg tri trn tro trp trr trs trt tsa tsb tsd tse tsg tsi tsn tso tsp tsr tss tst tta ttb ttd tte ttg tti ttn tto ttp ttr tts ttt