-er a-a a-b aaa aab aae aag aaj aak aan aao aar ab- aba abb abe abg abj abk abn abo abr aea aeb aee aeg aej aek aen aeo aer ag- aga agb age agg agj agk agn ago agr aja ajb aje ajj ajk ajn ajo ajr aka akb ake akg akj akk akn ako akr an- ana anb ane ang anj ank ann ano anr aoa aob aoe aog aoj aok aon aoo aor ar- ara arb are arg arj ark arn aro arr baa bab bae bag baj bak ban bao bar bba bbb bbe bbg bbk bbn bbo bbr be- bea beb bee beg bek ben beo ber bga bgb bge bgg bgk bgn bgo bgr bja bjg bjj bjk bjn bjr bka bkb bke bkg bkk bkn bko bkr bna bnb bne bng bnj bnk bnn bno bnr boa bob boe bog boj bok bon boo bor bra brb bre brg brj brk brn bro brr eaa eab eae eag eaj eak ean eao ear eba ebb ebe ebg ebj ebk ebn ebo ebr eea eeb eee eeg eek een eeo eer ega egb ege egg egn ego egr eja ejo eka ekb eke ekg eko ekr en- ena enb ene eng enk enn eno enr eo- eoa eob eoe eog eok eon eoo eor era erb ere erg erk ern ero err gaa gab gae gag gaj gak gan gao gar gba gbe gbg gbj gbk gbn gbo gbr ge- gea geb gee geg gek gen geo ger gga ggb ggg ggj ggn ggo ggr gja gje gjg gjr gka gkb gkn gko gna gnb gne gnn gno gnr goa gob goe gog gok gon goo gor gra grb gre grg grj grk grn gro grr jaa jab jae jag jaj jak jan jao jar jba jbg jbj jbk jbo jbr jea jeb jee jeg jej jek jen jeo jer jga jgb jge jgn jgo jgr jja jjb jjg jjj jjk jjr jka jkb jkk jkn jko jkr jna jne jng jnj jnn jno jnr joa job joe jog joj jok jon joo jor jra jrb jrg jrk jrn jro jrr ka- kaa kab kae kag kaj kak kan kao kar kba kbb kbe kbk kbn kbo kbr ke- kea keb kee keg kek ken keo ker kga kgb kgo kjb kje kjr kkb kke kkk kkn kkr kn- kna kne kng knk knn kno knr koa kob koe kog kok kon koo kor kra krg krk krn kro krr naa nab nae nag naj nak nan nao nar nba nbb nbe nbg nbk nbn nbo nbr ne- nea neb nee neg nej nek nen neo ner nga ngb nge ngg ngj ngk ngn ngo nja nje njk njn nka nke nkj nkk nkn nko nkr nna nnb nne nng nnk nnn nno no- noa nob noe nog noj nok non noo nor nra nrb nre nrg nrj nrk nrn nro nrr oaa oab oae oag oaj oak oan oao oar ob- oba obb obe obg obj obk obn obo obr oea oeb oee oeg oen oeo oer oga oge ogg ogn ogo oja ojb oje ojo oka okb oke okg okj okk oko okr on- ona onb one ong onj onk onn ono onr oo- ooa oob oog ook oon ooo oor or- ora orb ore org ork orn oro orr ra- raa rab rae rag raj rak ran rao rar rba rbb rbe rbg rbk rbn rbo rbr re- rea reb ree reg rek ren reo rer rga rgb rge rgg rgk rgn rgo rgr rja rjg rjk rjr rkb rke rkg rkk rko rna rnb rng rnn rno rnr roa rob roe rog roj rok ron roo ror rra rrb rrg rrk rrn rrr