-er a-a a-b a-t aaa aab aae aaj aao aar aat ab- aba abb abe abj abo abr abt aea aeb aee aej aeo aer aet aja ajb aje ajj ajo ajr ajt aoa aob aoe aoj aoo aor aot ar- ara arb are arj aro arr art at- ata atb ate ato atr att baa bab bae baj bao bar bat bba bbb bbe bbo bbr bbt be- bea beb bee beo ber bet bja bjj bjr bjt boa bob boe boj boo bor bot bra brb bre brj bro brr brt bta btb bte bto btr btt eaa eab eae eaj eao ear eat eba ebb ebe ebj ebo ebr ebt eea eeb eee eeo eer eet eja ejo ejt eo- eoa eob eoe eoo eor eot era erb ere ero err ert eta etb ete etj eto etr ett jaa jab jae jaj jao jar jat jba jbj jbo jbr jbt jea jeb jee jej jeo jer jet jja jjb jjj jjr joa job joe joj joo jor jot jra jrb jro jrr jrt jta jtb jte jtr jtt oaa oab oae oaj oao oar oat ob- oba obb obe obj obo obr obt oea oeb oee oeo oer oet oja ojb oje ojo oo- ooa oob ooo oor oot or- ora orb ore oro orr ort ot- ota otb ote oto otr ott ra- raa rab rae raj rao rar rat rba rbb rbe rbo rbr rbt re- rea reb ree reo rer ret rja rjr roa rob roe roj roo ror rot rra rrb rrr rrt rta rtb rte rtj rto rtr rtt taa tab tae taj tao tar tat tba tbb tbe tbj tbo tbr tbt te- tea teb tee tej teo ter tet tje tjo tjr to- toa tob toe toj too tor tot tra trb tre tro trr trt tta ttb tte tto ttr ttt