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