nrs nrt nsa nsb nsc nsh nsi nsl nsn nso nsp nsr nss nst nta ntb ntc nth nti ntn nto ntp ntr nts ntt o-i oaa oab oac oah oai oal oan oao oap oar oas oat ob- oba obb obc obh obi obl obn obo obp obr obs obt oc- oca ocb occ och oci ocl ocn oco ocp ocr ocs oct oha ohc ohh ohi ohl ohn oho ohp ohr ohs oht oia oib oic oii oil oin oio oip oir ois oit ola olb olc oli oll oln olo olp ols olt on- ona onb onc onh oni onl onn ono onp onr ons ont oo- ooa oob ooc ooh ooi ool oon ooo oop oor oos oot op- opa opb opc oph opi opl opn opo opp opr ops opt or- ora orb orc orh ori orl orn oro orp orr ors ort os- osa osb osc osh osi osl osn oso osp osr oss ost ot- ota otb otc oth oti otl otn oto otp otr ots ott p-p paa pab pac pah pai pal pan pao pap par pas pat pba pbb pbc pbi pbl pbn pbo pbp pbr pbs pbt pca pcb pcc pch pci pcl pcn pco pcp pcr pcs pct pha phb phc phi phl phn pho php phr phs pht pia pib pic pih pii pil pin pio pip pir pis pit pla plb plc plh pli pll pln plo plp plr pls plt pn- pna pnb pnc pnh pni pnl pnn pno pnp pnr pns pnt poa pob poc poh poi pol pon poo pop por pos pot ppa ppb ppc pph ppi ppl ppn ppo ppp ppr pps ppt pra prb prc prh pri prl prn pro prp prr prs prt ps- psa psb psc psh psi psl psn pso psp psr pss pst pt- pta ptb ptc pth pti ptl ptn pto ptp ptr pts ptt ra- raa rab rac rah rai ral ran rao rap rar ras rat rba rbb rbc rbh rbi rbl rbn rbo rbp rbr rbs rbt rca rcb rcc rch rci rcl rcn rco rcp rcr rcs rct rh- rha rhb rhc rhh rhi rhl rhn rho rhp rhr rhs rht ria rib ric rih rii ril rin rio rip rir ris rit rla rlc rlh rli rll rln rlo rlp rlr rls rlt rna rnb rnc rnh rni rnn rno rnp rnr rns rnt roa rob roc roh roi rol ron roo rop ror ros rot rpa rpb rpc rph rpi rpl rpn rpo rpp rpr rps rpt rra rrb rrc rrh rri rrl rrn rrp rrr rrs rrt rsa rsb rsc rsh rsi rsl rsn rso rsp rsr rss rst rta rtb rtc rti rtl rtn rto rtp rtr rts rtt saa sab sac sah sai sal san sao sap sar sas sat sba sbb sbc sbh sbi sbl sbn sbo sbp sbr sbs sbt sca scb scc sch sci scl scn sco scp scr scs sct sh- sha shb shc shh shi shl shn sho shp shr shs sht sia sib sic sih sii sil sin sio sip sir sis sit sla slb slc slh sli sll sln slo slp slr sls slt sna snb snc sni snl snn sno snp snr sns snt soa sob soc soh soi sol son soo sop sor sos sot spa spb spc sph spi spl spn spo spp spr sps spt sr- sra srb src srh sri srl srn sro srp srr srs srt ss- ssa ssb ssc ssh ssi ssl ssn sso ssp ssr sss sst sta stb stc sth sti stl stn sto stp str sts stt taa tab tac tah tai tal tan tao tap tar tas tat tba tbb tbc tbh tbi tbl tbn tbo tbp tbr tbs tbt tca tcb tcc tch tci tcl tcn tco tcp tcr tcs tct th- tha thb thc thh thi thl thn tho thp thr ths tht tia tib tic tih tii til tin tio tip tir tis tit tla tlc tlh tli tll tln tlo tlp tlr tls tlt tna tnb tnc tnh tni tnl tnn tno tnp tnr tns tnt to- toa tob toc toh toi tol ton too top tor tos tot tpa tpb tpc tph tpi tpl tpn tpo tpp tpr tps tpt tra trb trc trh tri trl trn tro trp trr trs trt tsa tsb tsc tsh tsi tsl tsn tso tsp tsr tss tst tta ttb ttc tth tti ttl ttn tto ttp ttr tts ttt