a-a a-b a-c a-t aaa aab aac aan aao aap aas aat ab- aba abb abc abn abo abp abs abt ac- aca acb acc acn aco acp acs act an- ana anb anc ann ano anp ans ant aoa aob aoc aon aoo aop aos aot ap- apa apb apc apn apo app aps apt as- asa asb asc asn aso asp ass ast at- ata atb atc atn ato atp ats att b-p baa bab bac ban bao bap bas bat bba bbb bbc bbn bbo bbp bbs bbt bca bcb bcc bcn bco bcp bcs bct bna bnb bnc bnn bno bnp bns bnt boa bob boc bon boo bop bos bot bpa bpb bpc bpn bpo bpp bps bpt bsa bsb bsc bsn bso bsp bss bst bta btb btc btn bto btp bts btt c-- caa cab cac can cao cap cas cat cba cbb cbc cbn cbo cbp cbs cbt cca ccb ccc ccn cco ccp ccs cct cn- cna cnb cnc cnn cno cnp cns cnt co- coa cob coc con coo cop cos cot cpa cpb cpc cpn cpo cpp cps cpt csa csb csc csn cso csp css cst cta ctb ctc ctn cto ctp cts ctt naa nab nac nan nao nap nas nat nba nbb nbc nbn nbo nbp nbs nbt nca ncb ncc ncn nco ncp ncs nct nna nnb nnc nnn nno nnp nns nnt no- noa nob noc non noo nop nos not npa npb npc npn npo npp nps npt nsa nsb nsc nsn nso nsp nss nst nta ntb ntc ntn nto ntp nts ntt oaa oab oac oan oao oap oas oat ob- oba obb obc obn obo obp obs obt oc- oca ocb occ ocn oco ocp ocs oct on- ona onb onc onn ono onp ons ont oo- ooa oob ooc oon ooo oop oos oot op- opa opb opc opn opo opp ops opt os- osa osb osc osn oso osp oss ost ot- ota otb otc otn oto otp ots ott p-p paa pab pac pan pao pap pas pat pba pbb pbc pbn pbo pbp pbs pbt pca pcb pcc pcn pco pcp pcs pct pn- pna pnb pnc pnn pno pnp pns pnt poa pob poc pon poo pop pos pot ppa ppb ppc ppn ppo ppp pps ppt ps- psa psb psc psn pso psp pss pst pt- pta ptb ptc ptn pto ptp pts ptt saa sab sac san sao sap sas sat sba sbb sbc sbn sbo sbp sbs sbt sca scb scc scn sco scp scs sct sna snb snc snn sno snp sns snt soa sob soc son soo sop sos sot spa spb spc spn spo spp sps spt ss- ssa ssb ssc ssn sso ssp sss sst sta stb stc stn sto stp sts stt taa tab tac tan tao tap tas tat tba tbb tbc tbn tbo tbp tbs tbt tca tcb tcc tcn tco tcp tcs tct tna tnb tnc tnn tno tnp tns tnt to- toa tob toc ton too top tos tot tpa tpb tpc tpn tpo tpp tps tpt tsa tsb tsc tsn tso tsp tss tst tta ttb ttc ttn tto ttp tts ttt