a-a a-b a-t aaa aab aad aan aao aar aat ab- aba abb abd abn abo abr abt ad- ada adb add adn ado adr adt an- ana anb and ann ano anr ant aoa aob aod aon aoo aor aot ar- ara arb ard arn aro arr art at- ata atb atd atn ato atr att baa bab bad ban bao bar bat bba bbb bbd bbn bbo bbr bbt bda bdb bdd bdo bdr bdt bna bnb bnd bnn bno bnr bnt boa bob bod bon boo bor bot bra brb brd brn bro brr brt bta btb btd btn bto btr btt daa dab dad dan dao dar dat dba dbb dbd dbn dbo dbr dbt dda ddb ddd ddn ddo ddr ddt dna dnb dnd dnn dno dnr dnt doa dob dod don doo dor dot dra drb drd drn dro drr drt dta dtb dtd dtn dto dtr dtt naa nab nad nan nao nar nat nba nbb nbd nbn nbo nbr nbt nda ndb ndd ndn ndo ndr ndt nna nnb nnn nno nnt no- noa nob nod non noo nor not nra nrb nrd nrn nro nrr nrt nta ntb ntd ntn nto ntr ntt oaa oab oad oan oao oar oat ob- oba obb obd obn obo obr obt oda odb odd odn odo odr odt on- ona onb ond onn ono onr ont oo- ooa oob ood oon ooo oor oot or- ora orb ord orn oro orr ort ot- ota otb otd otn oto otr ott ra- raa rab rad ran rao rar rat rba rbb rbd rbn rbo rbr rbt rda rdb rdd rdn rdo rdr rdt rna rnb rnd rnn rno rnr rnt roa rob rod ron roo ror rot rra rrb rrd rrn rrr rrt rta rtb rtd rtn rto rtr rtt taa tab tad tan tao tar tat tba tbb tbd tbn tbo tbr tbt tda tdb tdd tdn tdo tdr tdt tna tnb tnd tnn tno tnr tnt to- toa tob tod ton too tor tot tra trb trd trn tro trr trt tta ttb ttd ttn tto ttr ttt