-er a-a a-b a-i a-t aaa aab aae aag aai aan aap aar aat ab- aba abb abe abg abi abn abp abr abt aea aeb aee aeg aei aen aep aer aet ag- aga agb age agg agi agn agp agr agt ai- aia aib aie aig aii ain aip air ait an- ana anb ane ang ani ann anp anr ant ap- apa apb ape apg api apn app apr apt ar- ara arb are arg ari arn arp arr art at- ata atb ate atg ati atn atp atr att b-p baa bab bae bag bai ban bap bar bat bba bbb bbe bbg bbi bbn bbp bbr bbt be- bea beb bee beg bei ben bep ber bet bga bgb bge bgg bgi bgn bgp bgr bgt bi- bia bib bie big bii bin bip bir bit bna bnb bne bng bni bnn bnp bnr bnt bpa bpb bpe bpg bpi bpn bpp bpr bpt bra brb bre brg bri brn brp brr brt bta btb bte btg bti btn btp btr btt eaa eab eae eag eai ean eap ear eat eba ebb ebe ebg ebi ebn ebp ebr ebt eea eeb eee eeg een eep eer eet ega egb ege egg egi egn egp egr egt eia eib eie eig eii ein eip eir eit en- ena enb ene eng eni enn enp enr ent ep- epa epb epe epg epi epn epp epr ept era erb ere erg eri ern erp err ert eta etb ete etg eti etn etp etr ett g-p gaa gab gae gag gai gan gap gar gat gba gbe gbg gbi gbn gbp gbr gbt ge- gea geb gee geg gei gen gep ger get gga ggb ggg ggi ggn ggp ggr ggt gia gib gie gig gii gin gip gir git gna gnb gne gni gnn gnp gnr gnt gpa gpb gpe gpg gpi gpn gpp gpr gpt gra grb gre grg gri grn grp grr grt gta gtb gte gtg gti gtn gtp gtr gtt ia- iaa iab iae iag iai ian iap iar iat iba ibb ibe ibg ibi ibn ibp ibr ibt ie- iea iee ieg iei ien iep ier iet iga igb ige igg igi ign igp igr igt iia iib iie iii iin iip iir iit in- ina inb ine ing ini inn inp inr int ipa ipb ipe ipg ipi ipn ipp ipr ipt ir- ira irb ire irg iri irn irp irr irt ita itb ite itg iti itn itp itt n-i naa nab nae nag nai nan nap nar nat nba nbb nbe nbg nbi nbn nbp nbr nbt ne- nea neb nee neg nei nen nep ner net nga ngb nge ngg ngi ngn ngp ngt nia nib nie nig nii nin nip nir nit nna nnb nne nng nni nnn nnp nnt npa npb npe npg npi npn npp npr npt nra nrb nre nrg nri nrn nrp nrr nrt nta ntb nte ntg nti ntn ntp ntr ntt p-p paa pab pae pag pai pan pap par pat pba pbb pbe pbg pbi pbn pbp pbr pbt pea peb pee peg pei pen pep per pet pga pgb pge pgg pgi pgn pgp pgr pgt pia pib pie pig pii pin pip pir pit pn- pna pnb pne png pni pnn pnp pnr pnt ppa ppb ppe ppg ppi ppn ppp ppr ppt pra prb pre prg pri prn prp prr prt pt- pta ptb pte ptg pti ptn ptp ptr ptt ra- raa rab rae rag rai ran rap rar rat rba rbb rbe rbg rbi rbn rbp rbr rbt re- rea reb ree reg rei ren rep rer ret rga rgb rge rgg rgi rgn rgp rgr rgt ria rib rie rig rii rin rip rir rit rna rnb rng rni rnn rnp rnr rnt rpa rpb rpe rpg rpi rpn rpp rpr rpt rra rrb rrg rri rrn rrp rrr rrt rta rtb rte rtg rti rtn rtp rtr rtt taa tab tae tag tai tan tap tar tat tba tbb tbe tbg tbi tbn tbp tbr tbt te- tea teb tee teg tei ten tep ter tet tga tgb tge tgg tgi tgn tgp tgr tgt tia tib tie tig tii tin tip tir tit tna tnb tne tng tni tnn tnp tnr tnt tpa tpb tpe tpg tpi tpn tpp tpr tpt tra trb tre trg tri trn trp trr trt tta ttb tte ttg tti ttn ttp ttr ttt