-er a-a a-b aaa aab aae aag aaj aan aao aar ab- aba abb abe abg abj abn abo abr aea aeb aee aeg aej aen aeo aer ag- aga agb age agg agj agn ago agr aja ajb aje ajj ajn ajo ajr an- ana anb ane ang anj ann ano anr aoa aob aoe aog aoj aon aoo aor ar- ara arb are arg arj arn aro arr baa bab bae bag baj ban bao bar bba bbb bbe bbg bbn bbo bbr be- bea beb bee beg ben beo ber bga bgb bge bgg bgn bgo bgr bja bjg bjj bjn bjr bna bnb bne bng bnj bnn bno bnr boa bob boe bog boj bon boo bor bra brb bre brg brj brn bro brr eaa eab eae eag eaj ean eao ear eba ebb ebe ebg ebj ebn ebo ebr eea eeb eee eeg een eeo eer ega egb ege egg egn ego egr eja ejo en- ena enb ene eng enn eno enr eo- eoa eob eoe eog eon eoo eor era erb ere erg ern ero err gaa gab gae gag gaj gan gao gar gba gbe gbg gbj gbn gbo gbr ge- gea geb gee geg gen geo ger gga ggb ggg ggj ggn ggo ggr gja gje gjg gjr gna gnb gne gnn gno gnr goa gob goe gog gon goo gor gra grb gre grg grj grn gro grr jaa jab jae jag jaj jan jao jar jba jbg jbj jbo jbr jea jeb jee jeg jej jen jeo jer jga jgb jge jgn jgo jgr jja jjb jjg jjj jjr jna jne jng jnj jnn jno jnr joa job joe jog joj jon joo jor jra jrb jrg jrn jro jrr naa nab nae nag naj nan nao nar nba nbb nbe nbg nbn nbo nbr ne- nea neb nee neg nej nen neo ner nga ngb nge ngg ngj ngn ngo nja nje njn nna nnb nne nng nnn nno no- noa nob noe nog noj non noo nor nra nrb nre nrg nrj nrn nro nrr oaa oab oae oag oaj oan oao oar ob- oba obb obe obg obj obn obo obr oea oeb oee oeg oen oeo oer oga oge ogg ogn ogo oja ojb oje ojo on- ona onb one ong onj onn ono onr oo- ooa oob oog oon ooo oor or- ora orb ore org orn oro orr ra- raa rab rae rag raj ran rao rar rba rbb rbe rbg rbn rbo rbr re- rea reb ree reg ren reo rer rga rgb rge rgg rgn rgo rgr rja rjg rjr rna rnb rng rnn rno rnr roa rob roe rog roj ron roo ror rra rrb rrg rrn rrr