a-a a-b a-c a-t aaa aab aac aak aao aap aas aat ab- aba abb abc abk abo abp abs abt ac- aca acb acc ack aco acp acs act aka akb akc akk ako akp aks aoa aob aoc aok aoo aop aos aot ap- apa apb apc apk apo app aps apt as- asa asb asc ask aso asp ass ast at- ata atb atc ato atp ats att b-p baa bab bac bak bao bap bas bat bba bbb bbc bbk bbo bbp bbs bbt bca bcb bcc bck bco bcp bcs bct bka bkb bkc bkk bko bkp bks bkt boa bob boc bok boo bop bos bot bpa bpb bpc bpo bpp bps bpt bsa bsb bsc bsk bso bsp bss bst bta btb btc btk bto btp bts btt c-- caa cab cac cak cao cap cas cat cba cbb cbc cbk cbo cbp cbs cbt cca ccb ccc cck cco ccp ccs cct cka ckb ckc cko cks ckt co- coa cob coc cok coo cop cos cot cpa cpb cpc cpk cpo cpp cps cpt csa csb csc csk cso csp css cst cta ctb ctc ctk cto ctp cts ctt k-t ka- kaa kab kac kak kao kap kas kat kba kbb kbc kbk kbo kbp kbs kca kcb kcc kck kcp kcs kct kkb kkc kkk kkp kks kkt koa kob koc kok koo kop kos kot kpa kpc kpk kpo kpp kps kpt ksa ksb ksc ksk kso ksp kss kst kta ktb ktc ktk kto ktp kts ktt oaa oab oac oak oao oap oas oat ob- oba obb obc obk obo obp obs obt oc- oca ocb occ ock oco ocp ocs oct oka okb okc okk oko okp oks oo- ooa oob ooc ook ooo oop oos oot op- opa opb opc opk opo opp ops opt os- osa osb osc osk oso osp oss ost ot- ota otb otc otk oto otp ots ott p-p paa pab pac pak pao pap pas pat pba pbb pbc pbk pbo pbp pbs pbt pca pcb pcc pck pco pcp pcs pct pka pkb pkc pko pkp pks pkt poa pob poc pok poo pop pos pot ppa ppb ppc ppk ppo ppp pps ppt ps- psa psb psc psk pso psp pss pst pt- pta ptb ptc ptk pto ptp pts ptt saa sab sac sak sao sap sas sat sba sbb sbc sbk sbo sbp sbs sbt sca scb scc sck sco scp scs sct sk- ska skb skc skk sko skp sks skt soa sob soc sok soo sop sos sot spa spb spc spk spo spp sps spt ss- ssa ssb ssc ssk sso ssp sss sst sta stb stc stk sto stp sts stt taa tab tac tak tao tap tas tat tba tbb tbc tbk tbo tbp tbs tbt tca tcb tcc tck tco tcp tcs tct tka tkb tkc tkk tko tkp tks tkt to- toa tob toc tok too top tos tot tpa tpb tpc tpk tpo tpp tps tpt tsa tsb tsc tsk tso tsp tss tst tta ttb ttc ttk tto ttp tts ttt