a-a a-b a-t aaa aab aad aan aao aar aat aau ab- aba abb abd abn abo abr abt abu ad- ada adb add adn ado adr adt adu an- ana anb and ann ano anr ant anu aoa aob aod aon aoo aor aot aou ar- ara arb ard arn aro arr art aru at- ata atb atd atn ato atr att atu au- aua aub aud aun auo aur aut b-u baa bab bad ban bao bar bat bau bba bbb bbd bbn bbo bbr bbt bbu bda bdb bdd bdo bdr bdt bdu bna bnb bnd bnn bno bnr bnt bnu boa bob bod bon boo bor bot bou bra brb brd brn bro brr brt bru bta btb btd btn bto btr btt btu bua bub bud bun buo bur but buu daa dab dad dan dao dar dat dau dba dbb dbd dbn dbo dbr dbt dbu dda ddb ddd ddn ddo ddr ddt ddu dna dnb dnd dnn dno dnr dnt doa dob dod don doo dor dot dou dra drb drd drn dro drr drt dru dta dtb dtd dtn dto dtr dtt dtu dua dub dud dun duo dur dut naa nab nad nan nao nar nat nau nba nbb nbd nbn nbo nbr nbt nbu nda ndb ndd ndn ndo ndr ndt ndu nna nnb nnn nno nnt nnu no- noa nob nod non noo nor not nou nra nrb nrd nrn nro nrr nrt nru nta ntb ntd ntn nto ntr ntt ntu nua nub nud nun nuo nur nut nuu oaa oab oad oan oao oar oat oau ob- oba obb obd obn obo obr obt obu oda odb odd odn odo odr odt odu on- ona onb ond onn ono onr ont onu oo- ooa oob ood oon ooo oor oot or- ora orb ord orn oro orr ort oru ot- ota otb otd otn oto otr ott otu ou- oua oud oun ouo our out ra- raa rab rad ran rao rar rat rau rba rbb rbd rbn rbo rbr rbt rbu rda rdb rdd rdn rdo rdr rdt rdu rna rnb rnd rnn rno rnr rnt rnu roa rob rod ron roo ror rot rou rra rrb rrd rrn rrr rrt rru rta rtb rtd rtn rto rtr rtt rtu rua rub rud run ruo rur rut ruu taa tab tad tan tao tar tat tau tba tbb tbd tbn tbo tbr tbt tbu tda tdb tdd tdn tdo tdr tdt tdu tna tnb tnd tnn tno tnr tnt to- toa tob tod ton too tor tot tou tra trb trd trn tro trr trt tru tta ttb ttd ttn tto ttr ttt ttu tua tub tud tun tuo tur tut tuu ua- uaa uab uad uan uao uar uat uau uba ubb ubn ubo ubr ubt ubu uda udb udd udn udo udr udt udu un- una unb und unn uno unr unt unu uoa uob uod uon uoo uor uot ur- ura urb urd urn uro urr urt uru uta utb utd utn uto utr utt utu uua uun uur uut uuu