a-a a-b a-c a-t aaa aab aac aae aak aan aap aat ab- aba abb abc abe abk abn abp abt ac- aca acb acc ace ack acn acp act aea aeb aec aee aek aen aep aet aka akb akc ake akk akn akp an- ana anb anc ane ank ann anp ant ap- apa apb apc ape apk apn app apt at- ata atb atc ate atn atp att b-p baa bab bac bae bak ban bap bat bba bbb bbc bbe bbk bbn bbp bbt bca bcb bcc bce bck bcn bcp bct be- bea beb bec bee bek ben bep bet bka bkb bkc bke bkk bkn bkp bkt bna bnb bnc bne bnk bnn bnp bnt bpa bpb bpc bpe bpn bpp bpt bta btb btc bte btk btn btp btt c-- caa cab cac cae cak can cap cat cba cbb cbc cbe cbk cbn cbp cbt cca ccb ccc cce cck ccn ccp cct ce- cea ceb cec cee cek cen cep cet cka ckb ckc ckt cn- cna cnb cnc cne cnn cnp cnt cpa cpb cpc cpe cpk cpn cpp cpt cta ctb ctc cte ctk ctn ctp ctt eaa eab eac eae eak ean eap eat eba ebb ebc ebe ebk ebn ebp ebt ec- eca ecb ecc ece eck ecn ect eea eeb eec eee eek een eep eet eka ekb ekc eke ekp ekt en- ena enb enc ene enk enn enp ent ep- epa epb epc epe epn epp ept eta etb etc ete etk etn etp ett k-t ka- kaa kab kac kae kak kan kap kat kba kbb kbc kbe kbk kbn kbp kca kcb kcc kce kck kcn kcp kct ke- kea keb kec kee kek ken kep ket kkb kkc kke kkk kkn kkp kkt kn- kna knc kne knk knn knp knt kpa kpc kpe kpk kpn kpp kpt kta ktb ktc kte ktk ktn ktp ktt naa nab nac nae nak nan nap nat nba nbb nbc nbe nbk nbn nbp nbt nca ncb ncc nce nck ncn ncp nct ne- nea neb nec nee nek nen nep net nka nkc nke nkk nkn nkp nkt nna nnb nnc nne nnk nnn nnp nnt npa npb npc npe npn npp npt nta ntb ntc nte ntk ntn ntp ntt p-p paa pab pac pae pak pan pap pat pba pbb pbc pbe pbk pbn pbp pbt pca pcb pcc pce pck pcn pcp pct pea peb pec pee pek pen pep pet pka pkb pkc pke pkn pkp pkt pn- pna pnb pnc pne pnk pnn pnp pnt ppa ppb ppc ppe ppk ppn ppp ppt pt- pta ptb ptc pte ptk ptn ptp ptt taa tab tac tae tak tan tap tat tba tbb tbc tbe tbk tbn tbp tbt tca tcb tcc tce tck tcn tcp tct te- tea teb tec tee tek ten tep tet tka tkb tkc tke tkk tkp tkt tna tnb tnc tne tnk tnn tnp tnt tpa tpb tpc tpe tpk tpn tpp tpt tta ttb ttc tte ttk ttn ttp ttt