-er a-a a-b a-t aaa aab aae aag aaj aan aao aar aat ab- aba abb abe abg abj abn abo abr abt aea aeb aee aeg aej aen aeo aer aet ag- aga agb age agg agj agn ago agr agt aja ajb aje ajj ajn ajo ajr ajt an- ana anb ane ang anj ann ano anr ant aoa aob aoe aog aoj aon aoo aor aot ar- ara arb are arg arj arn aro arr art at- ata atb ate atg atn ato atr att baa bab bae bag baj ban bao bar bat bba bbb bbe bbg bbn bbo bbr bbt be- bea beb bee beg ben beo ber bet bga bgb bge bgg bgn bgo bgr bgt bja bjg bjj bjn bjr bjt bna bnb bne bng bnj bnn bno bnr bnt boa bob boe bog boj bon boo bor bot bra brb bre brg brj brn bro brr brt bta btb bte btg btn bto btr btt eaa eab eae eag eaj ean eao ear eat eba ebb ebe ebg ebj ebn ebo ebr ebt eea eeb eee eeg een eeo eer eet ega egb ege egg egn ego egr egt eja ejo ejt en- ena enb ene eng enn eno enr ent eo- eoa eob eoe eog eon eoo eor eot era erb ere erg ern ero err ert eta etb ete etg etj etn eto etr ett gaa gab gae gag gaj gan gao gar gat gba gbe gbg gbj gbn gbo gbr gbt ge- gea geb gee geg gen geo ger get gga ggb ggg ggj ggn ggo ggr ggt gja gje gjg gjr gjt gna gnb gne gnn gno gnr gnt goa gob goe gog gon goo gor got gra grb gre grg grj grn gro grr grt gta gtb gte gtg gtn gto gtr gtt jaa jab jae jag jaj jan jao jar jat jba jbg jbj jbo jbr jbt jea jeb jee jeg jej jen jeo jer jet jga jgb jge jgn jgo jgr jgt jja jjb jjg jjj jjr jna jne jng jnj jnn jno jnr jnt joa job joe jog joj jon joo jor jot jra jrb jrg jrn jro jrr jrt jta jtb jte jtg jtn jtr jtt naa nab nae nag naj nan nao nar nat nba nbb nbe nbg nbn nbo nbr nbt ne- nea neb nee neg nej nen neo ner net nga ngb nge ngg ngj ngn ngo ngt nja nje njn nna nnb nne nng nnn nno nnt no- noa nob noe nog noj non noo nor not nra nrb nre nrg nrj nrn nro nrr nrt nta ntb nte ntg ntn nto ntr ntt oaa oab oae oag oaj oan oao oar oat ob- oba obb obe obg obj obn obo obr obt oea oeb oee oeg oen oeo oer oet oga oge ogg ogn ogo ogt oja ojb oje ojo on- ona onb one ong onj onn ono onr ont oo- ooa oob oog oon ooo oor oot or- ora orb ore org orn oro orr ort ot- ota otb ote otg otn oto otr ott ra- raa rab rae rag raj ran rao rar rat rba rbb rbe rbg rbn rbo rbr rbt re- rea reb ree reg ren reo rer ret rga rgb rge rgg rgn rgo rgr rgt rja rjg rjr rna rnb rng rnn rno rnr rnt roa rob roe rog roj ron roo ror rot rra rrb rrg rrn rrr rrt rta rtb rte rtg rtj rtn rto rtr rtt taa tab tae tag taj tan tao tar tat tba tbb tbe tbg tbj tbn tbo tbr tbt te- tea teb tee teg tej ten teo ter tet tga tgb tge tgg tgn tgo tgr tgt tje tjo tjr tna tnb tne tng tnn tno tnr tnt to- toa tob toe tog toj ton too tor tot tra trb tre trg trn tro trr trt tta ttb tte ttg ttn tto ttr ttt