a-a a-b a-c a-t aaa aab aac aae aan aao aap aas aat ab- aba abb abc abe abn abo abp abs abt ac- aca acb acc ace acn aco acp acs act aea aeb aec aee aen aeo aep aes aet an- ana anb anc ane ann ano anp ans ant aoa aob aoc aoe aon aoo aop aos aot ap- apa apb apc ape apn apo app aps apt as- asa asb asc ase asn aso asp ass ast at- ata atb atc ate atn ato atp ats att b-p baa bab bac bae ban bao bap bas bat bba bbb bbc bbe bbn bbo bbp bbs bbt bca bcb bcc bce bcn bco bcp bcs bct be- bea beb bec bee ben beo bep bes bet bna bnb bnc bne bnn bno bnp bns bnt boa bob boc boe bon boo bop bos bot bpa bpb bpc bpe bpn bpo bpp bps bpt bsa bsb bsc bse bsn bso bsp bss bst bta btb btc bte btn bto btp bts btt c-- caa cab cac cae can cao cap cas cat cba cbb cbc cbe cbn cbo cbp cbs cbt cca ccb ccc cce ccn cco ccp ccs cct ce- cea ceb cec cee cen ceo cep ces cet cn- cna cnb cnc cne cnn cno cnp cns cnt co- coa cob coc coe con coo cop cos cot cpa cpb cpc cpe cpn cpo cpp cps cpt csa csb csc cse csn cso csp css cst cta ctb ctc cte ctn cto ctp cts ctt eaa eab eac eae ean eao eap eas eat eba ebb ebc ebe ebn ebo ebp ebs ebt ec- eca ecb ecc ece ecn eco ecs ect eea eeb eec eee een eeo eep ees eet en- ena enb enc ene enn eno enp ens ent eo- eoa eob eoc eoe eon eoo eop eos eot ep- epa epb epc epe epn epo epp eps ept es- esa esb esc ese esn eso esp ess est eta etb etc ete etn eto etp ets ett naa nab nac nae nan nao nap nas nat nba nbb nbc nbe nbn nbo nbp nbs nbt nca ncb ncc nce ncn nco ncp ncs nct ne- nea neb nec nee nen neo nep nes net nna nnb nnc nne nnn nno nnp nns nnt no- noa nob noc noe non noo nop nos not npa npb npc npe npn npo npp nps npt nsa nsb nsc nse nsn nso nsp nss nst nta ntb ntc nte ntn nto ntp nts ntt oaa oab oac oae oan oao oap oas oat ob- oba obb obc obe obn obo obp obs obt oc- oca ocb occ ocn oco ocp ocs oct oea oeb oec oee oen oeo oep oes oet on- ona onb onc one onn ono onp ons ont oo- ooa oob ooc oon ooo oop oos oot op- opa opb opc ope opn opo opp ops opt os- osa osb osc ose osn oso osp oss ost ot- ota otb otc ote otn oto otp ots ott p-p paa pab pac pae pan pao pap pas pat pba pbb pbc pbe pbn pbo pbp pbs pbt pca pcb pcc pce pcn pco pcp pcs pct pea peb pec pee pen peo pep pes pet pn- pna pnb pnc pne pnn pno pnp pns pnt poa pob poc poe pon poo pop pos pot ppa ppb ppc ppe ppn ppo ppp pps ppt ps- psa psb psc pse psn pso psp pss pst pt- pta ptb ptc pte ptn pto ptp pts ptt saa sab sac sae san sao sap sas sat sba sbb sbc sbe sbn sbo sbp sbs sbt sca scb scc sce scn sco scp scs sct se- sea seb sec see sen seo sep ses set sna snb snc sne snn sno snp sns snt soa sob soc soe son soo sop sos sot spa spb spc spe spn spo spp sps spt ss- ssa ssb ssc sse ssn sso ssp sss sst sta stb stc ste stn sto stp sts stt taa tab tac tae tan tao tap tas tat tba tbb tbc tbe tbn tbo tbp tbs tbt tca tcb tcc tce tcn tco tcp tcs tct te- tea teb tec tee ten teo tep tes tet tna tnb tnc tne tnn tno tnp tns tnt to- toa tob toc toe ton too top tos tot tpa tpb tpc tpe tpn tpo tpp tps tpt tsa tsb tsc tse tsn tso tsp tss tst tta ttb ttc tte ttn tto ttp tts ttt