npo npp npr nps npt nra nrb nrc nrd nre nri nrn nro nrp nrr nrs nrt nsa nsb nsc nsd nse nsi nsn nso nsp nsr nss nst nta ntb ntc ntd nte nti ntn nto ntp ntr nts ntt o-i oaa oab oac oad oae oai oan oao oap oar oas oat ob- oba obb obc obd obe obi obn obo obp obr obs obt oc- oca ocb occ ocd oci ocn oco ocp ocr ocs oct oda odb odc odd ode odi odn odo odp odr ods odt oea oeb oec oed oee oei oen oeo oep oer oes oet oia oib oic oid oie oii oin oio oip oir ois oit on- ona onb onc ond one oni onn ono onp onr ons ont oo- ooa oob ooc ood ooi oon ooo oop oor oos oot op- opa opb opc opd ope opi opn opo opp opr ops opt or- ora orb orc ord ore ori orn oro orp orr ors ort os- osa osb osc osd ose osi osn oso osp osr oss ost ot- ota otb otc otd ote oti otn oto otp otr ots ott p-p paa pab pac pad pae pai pan pao pap par pas pat pba pbb pbc pbd pbe pbi pbn pbo pbp pbr pbs pbt pca pcb pcc pcd pce pci pcn pco pcp pcr pcs pct pda pdb pdc pdd pde pdi pdn pdo pdp pdr pds pdt pea peb pec ped pee pei pen peo pep per pes pet pia pib pic pid pie pii pin pio pip pir pis pit pn- pna pnb pnc pnd pne pni pnn pno pnp pnr pns pnt poa pob poc pod poe poi pon poo pop por pos pot ppa ppb ppc ppd ppe ppi ppn ppo ppp ppr pps ppt pra prb prc prd pre pri prn pro prp prr prs prt ps- psa psb psc psd pse psi psn pso psp psr pss pst pt- pta ptb ptc ptd pte pti ptn pto ptp ptr pts ptt ra- raa rab rac rad rae rai ran rao rap rar ras rat rba rbb rbc rbd rbe rbi rbn rbo rbp rbr rbs rbt rca rcb rcc rcd rce rci rcn rco rcp rcr rcs rct rda rdb rdc rdd rde rdi rdn rdo rdp rdr rds rdt re- rea reb rec red ree rei ren reo rep rer res ret ria rib ric rid rie rii rin rio rip rir ris rit rna rnb rnc rnd rni rnn rno rnp rnr rns rnt roa rob roc rod roe roi ron roo rop ror ros rot rpa rpb rpc rpd rpe rpi rpn rpo rpp rpr rps rpt rra rrb rrc rrd rri rrn rrp rrr rrs rrt rsa rsb rsc rsd rse rsi rsn rso rsp rsr rss rst rta rtb rtc rtd rte rti rtn rto rtp rtr rts rtt saa sab sac sad sae sai san sao sap sar sas sat sba sbb sbc sbd sbe sbi sbn sbo sbp sbr sbs sbt sca scb scc scd sce sci scn sco scp scr scs sct sda sdb sdc sdd sde sdi sdn sdo sdp sdr sds sdt se- sea seb sec sed see sei sen seo sep ser ses set sia sib sic sid sie sii sin sio sip sir sis sit sna snb snc snd sne sni snn sno snp snr sns snt soa sob soc sod soe soi son soo sop sor sos sot spa spb spc spd spe spi spn spo spp spr sps spt sr- sra srb src srd sre sri srn sro srp srr srs srt ss- ssa ssb ssc ssd sse ssi ssn sso ssp ssr sss sst sta stb stc std ste sti stn sto stp str sts stt taa tab tac tad tae tai tan tao tap tar tas tat tba tbb tbc tbd tbe tbi tbn tbo tbp tbr tbs tbt tca tcb tcc tcd tce tci tcn tco tcp tcr tcs tct tda tdb tdc tdd tde tdi tdn tdo tdp tdr tds tdt te- tea teb tec ted tee tei ten teo tep ter tes tet tia tib tic tid tie tii tin tio tip tir tis tit tna tnb tnc tnd tne tni tnn tno tnp tnr tns tnt to- toa tob toc tod toe toi ton too top tor tos tot tpa tpb tpc tpd tpe tpi tpn tpo tpp tpr tps tpt tra trb trc trd tre tri trn tro trp trr trs trt tsa tsb tsc tsd tse tsi tsn tso tsp tsr tss tst tta ttb ttc ttd tte tti ttn tto ttp ttr tts ttt