a-a a-b a-t aaa aab aad aan aao aap aar aat ab- aba abb abd abn abo abp abr abt ad- ada adb add adn ado adp adr adt an- ana anb and ann ano anp anr ant aoa aob aod aon aoo aop aor aot ap- apa apb apd apn apo app apr apt ar- ara arb ard arn aro arp arr art at- ata atb atd atn ato atp atr att b-p baa bab bad ban bao bap bar bat bba bbb bbd bbn bbo bbp bbr bbt bda bdb bdd bdo bdp bdr bdt bna bnb bnd bnn bno bnp bnr bnt boa bob bod bon boo bop bor bot bpa bpb bpd bpn bpo bpp bpr bpt bra brb brd brn bro brp brr brt bta btb btd btn bto btp btr btt daa dab dad dan dao dap dar dat dba dbb dbd dbn dbo dbp dbr dbt dda ddb ddd ddn ddo ddp ddr ddt dna dnb dnd dnn dno dnp dnr dnt doa dob dod don doo dop dor dot dpa dpb dpd dpn dpo dpp dpr dpt dra drb drd drn dro drp drr drt dta dtb dtd dtn dto dtp dtr dtt naa nab nad nan nao nap nar nat nba nbb nbd nbn nbo nbp nbr nbt nda ndb ndd ndn ndo ndp ndr ndt nna nnb nnn nno nnp nnt no- noa nob nod non noo nop nor not npa npb npd npn npo npp npr npt nra nrb nrd nrn nro nrp nrr nrt nta ntb ntd ntn nto ntp ntr ntt oaa oab oad oan oao oap oar oat ob- oba obb obd obn obo obp obr obt oda odb odd odn odo odp odr odt on- ona onb ond onn ono onp onr ont oo- ooa oob ood oon ooo oop oor oot op- opa opb opd opn opo opp opr opt or- ora orb ord orn oro orp orr ort ot- ota otb otd otn oto otp otr ott p-p paa pab pad pan pao pap par pat pba pbb pbd pbn pbo pbp pbr pbt pda pdb pdd pdn pdo pdp pdr pdt pn- pna pnb pnd pnn pno pnp pnr pnt poa pob pod pon poo pop por pot ppa ppb ppd ppn ppo ppp ppr ppt pra prb prd prn pro prp prr prt pt- pta ptb ptd ptn pto ptp ptr ptt ra- raa rab rad ran rao rap rar rat rba rbb rbd rbn rbo rbp rbr rbt rda rdb rdd rdn rdo rdp rdr rdt rna rnb rnd rnn rno rnp rnr rnt roa rob rod ron roo rop ror rot rpa rpb rpd rpn rpo rpp rpr rpt rra rrb rrd rrn rrp rrr rrt rta rtb rtd rtn rto rtp rtr rtt taa tab tad tan tao tap tar tat tba tbb tbd tbn tbo tbp tbr tbt tda tdb tdd tdn tdo tdp tdr tdt tna tnb tnd tnn tno tnp tnr tnt to- toa tob tod ton too top tor tot tpa tpb tpd tpn tpo tpp tpr tpt tra trb trd trn tro trp trr trt tta ttb ttd ttn tto ttp ttr ttt