nra nrb nrd nre nri nrl nrn nro nrp nrr nrs nrt nsa nsb nsd nse nsi nsl nsn nso nsp nsr nss nst nta ntb ntd nte nti ntn nto ntp ntr nts ntt o-i oaa oab oad oae oai oal oan oao oap oar oas oat ob- oba obb obd obe obi obl obn obo obp obr obs obt oda odb odd ode odi odl odn odo odp odr ods odt oea oeb oed oee oei oel oen oeo oep oer oes oet oia oib oid oie oii oil oin oio oip oir ois oit ola olb old ole oli oll oln olo olp ols olt on- ona onb ond one oni onl onn ono onp onr ons ont oo- ooa oob ood ooi ool oon ooo oop oor oos oot op- opa opb opd ope opi opl opn opo opp opr ops opt or- ora orb ord ore ori orl orn oro orp orr ors ort os- osa osb osd ose osi osl osn oso osp osr oss ost ot- ota otb otd ote oti otl otn oto otp otr ots ott p-p paa pab pad pae pai pal pan pao pap par pas pat pba pbb pbd pbe pbi pbl pbn pbo pbp pbr pbs pbt pda pdb pdd pde pdi pdl pdn pdo pdp pdr pds pdt pea peb ped pee pei pel pen peo pep per pes pet pia pib pid pie pii pil pin pio pip pir pis pit pla plb pld ple pli pll pln plo plp plr pls plt pn- pna pnb pnd pne pni pnl pnn pno pnp pnr pns pnt poa pob pod poe poi pol pon poo pop por pos pot ppa ppb ppd ppe ppi ppl ppn ppo ppp ppr pps ppt pra prb prd pre pri prl prn pro prp prr prs prt ps- psa psb psd pse psi psl psn pso psp psr pss pst pt- pta ptb ptd pte pti ptl ptn pto ptp ptr pts ptt ra- raa rab rad rae rai ral ran rao rap rar ras rat rba rbb rbd rbe rbi rbl rbn rbo rbp rbr rbs rbt rda rdb rdd rde rdi rdl rdn rdo rdp rdr rds rdt re- rea reb red ree rei rel ren reo rep rer res ret ria rib rid rie rii ril rin rio rip rir ris rit rla rld rle rli rll rln rlo rlp rlr rls rlt rna rnb rnd rni rnn rno rnp rnr rns rnt roa rob rod roe roi rol ron roo rop ror ros rot rpa rpb rpd rpe rpi rpl rpn rpo rpp rpr rps rpt rra rrb rrd rri rrl rrn rrp rrr rrs rrt rsa rsb rsd rse rsi rsl rsn rso rsp rsr rss rst rta rtb rtd rte rti rtl rtn rto rtp rtr rts rtt saa sab sad sae sai sal san sao sap sar sas sat sba sbb sbd sbe sbi sbl sbn sbo sbp sbr sbs sbt sda sdb sdd sde sdi sdl sdn sdo sdp sdr sds sdt se- sea seb sed see sei sel sen seo sep ser ses set sia sib sid sie sii sil sin sio sip sir sis sit sla slb sld sle sli sll sln slo slp slr sls slt sna snb snd sne sni snl snn sno snp snr sns snt soa sob sod soe soi sol son soo sop sor sos sot spa spb spd spe spi spl spn spo spp spr sps spt sr- sra srb srd sre sri srl srn sro srp srr srs srt ss- ssa ssb ssd sse ssi ssl ssn sso ssp ssr sss sst sta stb std ste sti stl stn sto stp str sts stt taa tab tad tae tai tal tan tao tap tar tas tat tba tbb tbd tbe tbi tbl tbn tbo tbp tbr tbs tbt tda tdb tdd tde tdi tdl tdn tdo tdp tdr tds tdt te- tea teb ted tee tei tel ten teo tep ter tes tet tia tib tid tie tii til tin tio tip tir tis tit tla tld tle tli tll tln tlo tlp tlr tls tlt tna tnb tnd tne tni tnl tnn tno tnp tnr tns tnt to- toa tob tod toe toi tol ton too top tor tos tot tpa tpb tpd tpe tpi tpl tpn tpo tpp tpr tps tpt tra trb trd tre tri trl trn tro trp trr trs trt tsa tsb tsd tse tsi tsl tsn tso tsp tsr tss tst tta ttb ttd tte tti ttl ttn tto ttp ttr tts ttt