a-a a-b a-t aaa aab aad aak aan aao aar aat ab- aba abb abd abk abn abo abr abt ad- ada adb add adk adn ado adr adt aka akb akd akk akn ako akr an- ana anb and ank ann ano anr ant aoa aob aod aok aon aoo aor aot ar- ara arb ard ark arn aro arr art at- ata atb atd atn ato atr att baa bab bad bak ban bao bar bat bba bbb bbd bbk bbn bbo bbr bbt bda bdb bdd bdk bdo bdr bdt bka bkb bkk bkn bko bkr bkt bna bnb bnd bnk bnn bno bnr bnt boa bob bod bok bon boo bor bot bra brb brd brk brn bro brr brt bta btb btd btk btn bto btr btt daa dab dad dak dan dao dar dat dba dbb dbd dbk dbn dbo dbr dbt dda ddb ddd ddk ddn ddo ddr ddt dka dkb dkk dko dkr dkt dna dnb dnd dnk dnn dno dnr dnt doa dob dod dok don doo dor dot dra drb drd drk drn dro drr drt dta dtb dtd dtk dtn dto dtr dtt k-t ka- kaa kab kad kak kan kao kar kat kba kbb kbd kbk kbn kbo kbr kda kdb kdk kdo kdr kdt kkb kkk kkn kkr kkt kn- kna knd knk knn kno knr knt koa kob kod kok kon koo kor kot kra krd krk krn kro krr krt kta ktb ktk ktn kto ktr ktt naa nab nad nak nan nao nar nat nba nbb nbd nbk nbn nbo nbr nbt nda ndb ndd ndk ndn ndo ndr ndt nka nkk nkn nko nkr nkt nna nnb nnk nnn nno nnt no- noa nob nod nok non noo nor not nra nrb nrd nrk nrn nro nrr nrt nta ntb ntd ntk ntn nto ntr ntt oaa oab oad oak oan oao oar oat ob- oba obb obd obk obn obo obr obt oda odb odd odn odo odr odt oka okb okd okk oko okr on- ona onb ond onk onn ono onr ont oo- ooa oob ood ook oon ooo oor oot or- ora orb ord ork orn oro orr ort ot- ota otb otd otk otn oto otr ott ra- raa rab rad rak ran rao rar rat rba rbb rbd rbk rbn rbo rbr rbt rda rdb rdd rdn rdo rdr rdt rkb rkk rko rkt rna rnb rnd rnn rno rnr rnt roa rob rod rok ron roo ror rot rra rrb rrd rrk rrn rrr rrt rta rtb rtd rtk rtn rto rtr rtt taa tab tad tak tan tao tar tat tba tbb tbd tbk tbn tbo tbr tbt tda tdb tdd tdk tdn tdo tdr tdt tka tkb tkk tko tkr tkt tna tnb tnd tnk tnn tno tnr tnt to- toa tob tod tok ton too tor tot tra trb trd trk trn tro trr trt tta ttb ttd ttk ttn tto ttr ttt