-er a-a a-b a-i a-t aaa aab aae aai aak aan aao aap aar aat ab- aba abb abe abi abk abn abo abp abr abt aea aeb aee aei aek aen aeo aep aer aet ai- aia aib aie aii aik ain aio aip air ait aka akb ake aki akk akn ako akp akr an- ana anb ane ani ank ann ano anp anr ant aoa aob aoe aoi aok aon aoo aop aor aot ap- apa apb ape api apk apn apo app apr apt ar- ara arb are ari ark arn aro arp arr art at- ata atb ate ati atn ato atp atr att b-p baa bab bae bai bak ban bao bap bar bat bba bbb bbe bbi bbk bbn bbo bbp bbr bbt be- bea beb bee bei bek ben beo bep ber bet bi- bia bib bie bii bik bin bio bip bir bit bka bkb bke bkk bkn bko bkp bkr bkt bna bnb bne bni bnk bnn bno bnp bnr bnt boa bob boe boi bok bon boo bop bor bot bpa bpb bpe bpi bpn bpo bpp bpr bpt bra brb bre bri brk brn bro brp brr brt bta btb bte bti btk btn bto btp btr btt eaa eab eae eai eak ean eao eap ear eat eba ebb ebe ebi ebk ebn ebo ebp ebr ebt eea eeb eee eek een eeo eep eer eet eia eib eie eii eik ein eio eip eir eit eka ekb eke eki eko ekp ekr ekt en- ena enb ene eni enk enn eno enp enr ent eo- eoa eob eoe eoi eok eon eoo eop eor eot ep- epa epb epe epi epn epo epp epr ept era erb ere eri erk ern ero erp err ert eta etb ete eti etk etn eto etp etr ett ia- iaa iab iae iai ian iao iap iar iat iba ibb ibe ibi ibk ibn ibo ibp ibr ibt ie- iea iee iei iek ien iep ier iet iia iib iie iii iin iio iip iir iit ika ikb ike iki ikk iko ikr ikt in- ina inb ine ini ink inn ino inp inr int io- ioa iob ioe ioi ion ioo iop ior iot ipa ipb ipe ipi ipn ipo ipp ipr ipt ir- ira irb ire iri irk irn iro irp irr irt ita itb ite iti itk itn ito itp itt k-t ka- kaa kab kae kai kak kan kao kap kar kat kba kbb kbe kbi kbk kbn kbo kbp kbr ke- kea keb kee kei kek ken keo kep ker ket kia kib kie kii kik kin kio kip kir kit kkb kke kki kkk kkn kkp kkr kkt kn- kna kne kni knk knn kno knp knr knt koa kob koe koi kok kon koo kop kor kot kpa kpe kpi kpk kpn kpo kpp kpr kpt kra kri krk krn kro krp krr krt kta ktb kte ktk ktn kto ktp ktr ktt n-i naa nab nae nai nak nan nao nap nar nat nba nbb nbe nbi nbk nbn nbo nbp nbr nbt ne- nea neb nee nei nek nen neo nep ner net nia nib nie nii nik nin nio nip nir nit nka nke nki nkk nkn nko nkp nkr nkt nna nnb nne nni nnk nnn nno nnp nnt no- noa nob noe noi nok non noo nop nor not npa npb npe npi npn npo npp npr npt nra nrb nre nri nrk nrn nro nrp nrr nrt nta ntb nte nti ntk ntn nto ntp ntr ntt o-i oaa oab oae oai oak oan oao oap oar oat ob- oba obb obe obi obk obn obo obp obr obt oea oeb oee oei oen oeo oep oer oet oia oib oie oii oik oin oio oip oir oit oka okb oke oki okk oko okp okr on- ona onb one oni onk onn ono onp onr ont oo- ooa oob ooi ook oon ooo oop oor oot op- opa opb ope opi opk opn opo opp opr opt or- ora orb ore ori ork orn oro orp orr ort ot- ota otb ote oti otk otn oto otp otr ott p-p paa pab pae pai pak pan pao pap par pat pba pbb pbe pbi pbk pbn pbo pbp pbr pbt pea peb pee pei pek pen peo pep per pet pia pib pie pii pik pin pio pip pir pit pka pkb pke pki pkn pko pkp pkr pkt pn- pna pnb pne pni pnk pnn pno pnp pnr pnt poa pob poe poi pok pon poo pop por pot ppa ppb ppe ppi ppk ppn ppo ppp ppr ppt pra prb pre pri prk prn pro prp prr prt pt- pta ptb pte pti ptk ptn pto ptp ptr ptt ra- raa rab rae rai rak ran rao rap rar rat rba rbb rbe rbi rbk rbn rbo rbp rbr rbt re- rea reb ree rei rek ren reo rep rer ret ria rib rie rii rik rin rio rip rir rit rkb rke rkk rko rkp rkt rna rnb rni rnn rno rnp rnr rnt roa rob roe roi rok ron roo rop ror rot rpa rpb rpe rpi rpk rpn rpo rpp rpr rpt rra rrb rri rrk rrn rrp rrr rrt rta rtb rte rti rtk rtn rto rtp rtr rtt taa tab tae tai tak tan tao tap tar tat tba tbb tbe tbi tbk tbn tbo tbp tbr tbt te- tea teb tee tei tek ten teo tep ter tet tia tib tie tii tik tin tio tip tir tit tka tkb tke tkk tko tkp tkr tkt tna tnb tne tni tnk tnn tno tnp tnr tnt to- toa tob toe toi tok ton too top tor tot tpa tpb tpe tpi tpk tpn tpo tpp tpr tpt tra trb tre tri trk trn tro trp trr trt tta ttb tte tti ttk ttn tto ttp ttr ttt