-er a-a a-b a-i a-t aaa aab aae aai aan aao aap aar aat ab- aba abb abe abi abn abo abp abr abt aea aeb aee aei aen aeo aep aer aet ai- aia aib aie aii ain aio aip air ait an- ana anb ane ani ann ano anp anr ant aoa aob aoe aoi aon aoo aop aor aot ap- apa apb ape api apn apo app apr apt ar- ara arb are ari arn aro arp arr art at- ata atb ate ati atn ato atp atr att b-p baa bab bae bai ban bao bap bar bat bba bbb bbe bbi bbn bbo bbp bbr bbt be- bea beb bee bei ben beo bep ber bet bi- bia bib bie bii bin bio bip bir bit bna bnb bne bni bnn bno bnp bnr bnt boa bob boe boi bon boo bop bor bot bpa bpb bpe bpi bpn bpo bpp bpr bpt bra brb bre bri brn bro brp brr brt bta btb bte bti btn bto btp btr btt eaa eab eae eai ean eao eap ear eat eba ebb ebe ebi ebn ebo ebp ebr ebt eea eeb eee een eeo eep eer eet eia eib eie eii ein eio eip eir eit en- ena enb ene eni enn eno enp enr ent eo- eoa eob eoe eoi eon eoo eop eor eot ep- epa epb epe epi epn epo epp epr ept era erb ere eri ern ero erp err ert eta etb ete eti etn eto etp etr ett ia- iaa iab iae iai ian iao iap iar iat iba ibb ibe ibi ibn ibo ibp ibr ibt ie- iea iee iei ien iep ier iet iia iib iie iii iin iio iip iir iit in- ina inb ine ini 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 irn iro irp irr irt ita itb ite iti itn ito itp itt n-i naa nab nae nai nan nao nap nar nat nba nbb nbe nbi nbn nbo nbp nbr nbt ne- nea neb nee nei nen neo nep ner net nia nib nie nii nin nio nip nir nit nna nnb nne nni nnn nno nnp nnt no- noa nob noe noi non noo nop nor not npa npb npe npi npn npo npp npr npt nra nrb nre nri nrn nro nrp nrr nrt nta ntb nte nti ntn nto ntp ntr ntt o-i oaa oab oae oai oan oao oap oar oat ob- oba obb obe obi obn obo obp obr obt oea oeb oee oei oen oeo oep oer oet oia oib oie oii oin oio oip oir oit on- ona onb one oni onn ono onp onr ont oo- ooa oob ooi oon ooo oop oor oot op- opa opb ope opi opn opo opp opr opt or- ora orb ore ori orn oro orp orr ort ot- ota otb ote oti otn oto otp otr ott p-p paa pab pae pai pan pao pap par pat pba pbb pbe pbi pbn pbo pbp pbr pbt pea peb pee pei pen peo pep per pet pia pib pie pii pin pio pip pir pit pn- pna pnb pne pni pnn pno pnp pnr pnt poa pob poe poi pon poo pop por pot ppa ppb ppe ppi ppn ppo ppp ppr ppt pra prb pre pri prn pro prp prr prt pt- pta ptb pte pti ptn pto ptp ptr ptt ra- raa rab rae rai ran rao rap rar rat rba rbb rbe rbi rbn rbo rbp rbr rbt re- rea reb ree rei ren reo rep rer ret ria rib rie rii rin rio rip rir rit rna rnb rni rnn rno rnp rnr rnt roa rob roe roi ron roo rop ror rot rpa rpb rpe rpi rpn rpo rpp rpr rpt rra rrb rri rrn rrp rrr rrt rta rtb rte rti rtn rto rtp rtr rtt taa tab tae tai tan tao tap tar tat tba tbb tbe tbi tbn tbo tbp tbr tbt te- tea teb tee tei ten teo tep ter tet tia tib tie tii tin tio tip tir tit tna tnb tne tni tnn tno tnp tnr tnt to- toa tob toe toi ton too top tor tot tpa tpb tpe tpi tpn tpo tpp tpr tpt tra trb tre tri trn tro trp trr trt tta ttb tte tti ttn tto ttp ttr ttt