nrn nro nrp nrr nrs nrt nsa nsb nse nsf nsi nsl nsn nso nsp nsr nss nst nta ntb nte ntf nti ntn nto ntp ntr nts ntt o-i oaa oab oae oaf oai oal oan oao oap oar oas oat ob- oba obb obe obf obi obl obn obo obp obr obs obt oea oeb oee oef oei oel oen oeo oep oer oes oet of- ofa ofb ofe off ofi ofl ofn ofo ofp ofr ofs oft oia oib oie oif oii oil oin oio oip oir ois oit ola olb ole olf oli oll oln olo olp ols olt on- ona onb one onf oni onl onn ono onp onr ons ont oo- ooa oob oof ooi ool oon ooo oop oor oos oot op- opa opb ope opf opi opl opn opo opp opr ops opt or- ora orb ore orf ori orl orn oro orp orr ors ort os- osa osb ose osf osi osl osn oso osp osr oss ost ot- ota otb ote otf oti otl otn oto otp otr ots ott p-p paa pab pae paf pai pal pan pao pap par pas pat pba pbb pbe pbf pbi pbl pbn pbo pbp pbr pbs pbt pea peb pee pef pei pel pen peo pep per pes pet pfa pfb pfe pff pfi pfl pfn pfo pfp pfr pfs pft pia pib pie pif pii pil pin pio pip pir pis pit pla plb ple plf pli pll pln plo plp plr pls plt pn- pna pnb pne pnf pni pnl pnn pno pnp pnr pns pnt poa pob poe pof poi pol pon poo pop por pos pot ppa ppb ppe ppf ppi ppl ppn ppo ppp ppr pps ppt pra prb pre prf pri prl prn pro prp prr prs prt ps- psa psb pse psf psi psl psn pso psp psr pss pst pt- pta ptb pte ptf pti ptl ptn pto ptp ptr pts ptt ra- raa rab rae raf rai ral ran rao rap rar ras rat rba rbb rbe rbf rbi rbl rbn rbo rbp rbr rbs rbt re- rea reb ree ref rei rel ren reo rep rer res ret rfa rfb rfe rff rfi rfl rfn rfo rfp rfr rfs rft ria rib rie rif rii ril rin rio rip rir ris rit rla rle rlf rli rll rln rlo rlp rlr rls rlt rna rnb rni rnn rno rnp rnr rns rnt roa rob roe rof roi rol ron roo rop ror ros rot rpa rpb rpe rpf rpi rpl rpn rpo rpp rpr rps rpt rra rrb rrf rri rrl rrn rrp rrr rrs rrt rsa rsb rse rsf rsi rsl rsn rso rsp rsr rss rst rta rtb rte rtf rti rtl rtn rto rtp rtr rts rtt saa sab sae saf sai sal san sao sap sar sas sat sba sbb sbe sbf sbi sbl sbn sbo sbp sbr sbs sbt se- sea seb see sef sei sel sen seo sep ser ses set sfa sfb sfe sff sfi sfl sfn sfo sfp sfr sfs sft sia sib sie sif sii sil sin sio sip sir sis sit sla slb sle slf sli sll sln slo slp slr sls slt sna snb sne snf sni snl snn sno snp snr sns snt soa sob soe sof soi sol son soo sop sor sos sot spa spb spe spf spi spl spn spo spp spr sps spt sr- sra srb sre srf sri srl srn sro srp srr srs srt ss- ssa ssb sse ssf ssi ssl ssn sso ssp ssr sss sst sta stb ste stf sti stl stn sto stp str sts stt taa tab tae taf tai tal tan tao tap tar tas tat tba tbb tbe tbf tbi tbl tbn tbo tbp tbr tbs tbt te- tea teb tee tef tei tel ten teo tep ter tes tet tfa tfb tfe tff tfi tfl tfn tfo tfp tfr tfs tft tia tib tie tif tii til tin tio tip tir tis tit tla tle tlf tli tll tln tlo tlp tlr tls tlt tna tnb tne tnf tni tnl tnn tno tnp tnr tns tnt to- toa tob toe tof toi tol ton too top tor tos tot tpa tpb tpe tpf tpi tpl tpn tpo tpp tpr tps tpt tra trb tre trf tri trl trn tro trp trr trs trt tsa tsb tse tsf tsi tsl tsn tso tsp tsr tss tst tta ttb tte ttf tti ttl ttn tto ttp ttr tts ttt