-ic a-a a-b a-c a-i a-t aaa aab aac aae aai aak aao aap aas aat ab- aba abb abc abe abi abk abo abp abs abt ac- aca acb acc ace aci ack aco acp acs act aea aeb aec aee aei aek aeo aep aes aet ai- aia aib aic aie aii aik aio aip ais ait aka akb akc ake aki akk ako akp aks aoa aob aoc aoe aoi aok aoo aop aos aot ap- apa apb apc ape api apk apo app aps apt as- asa asb asc ase asi ask aso asp ass ast at- ata atb atc ate ati ato atp ats att b-p baa bab bac bae bai bak bao bap bas bat bba bbb bbc bbe bbi bbk bbo bbp bbs bbt bca bcb bcc bce bci bck bco bcp bcs bct be- bea beb bec bee bei bek beo bep bes bet bi- bia bib bic bie bii bik bio bip bis bit bka bkb bkc bke bkk bko bkp bks bkt boa bob boc boe boi bok boo bop bos bot bpa bpb bpc bpe bpi bpo bpp bps bpt bsa bsb bsc bse bsi bsk bso bsp bss bst bta btb btc bte bti btk bto btp bts btt c-- caa cab cac cae cai cak cao cap cas cat cba cbb cbc cbe cbi cbk cbo cbp cbs cbt cca ccb ccc cce cci cck cco ccp ccs cct ce- cea ceb cec cee cei cek ceo cep ces cet ci- cia cib cic cie cii cik cio cip cis cit cka ckb ckc cki cko cks ckt co- coa cob coc coe coi cok coo cop cos cot cpa cpb cpc cpe cpi cpk cpo cpp cps cpt csa csb csc cse csi csk cso csp css cst cta ctb ctc cte cti ctk cto ctp cts ctt eaa eab eac eae eai eak eao eap eas eat eba ebb ebc ebe ebi ebk ebo ebp ebs ebt ec- eca ecb ecc ece eci eck eco ecs ect eea eeb eec eee eek eeo eep ees eet eia eib eic eie eii eik eio eip eis eit eka ekb ekc eke eki eko ekp eks ekt eo- eoa eob eoc eoe eoi eok eoo eop eos eot ep- epa epb epc epe epi epo epp eps ept es- esa esb esc ese esi esk eso esp ess est eta etb etc ete eti etk eto etp ets ett ia- iaa iab iac iae iai iao iap ias iat iba ibb ibc ibe ibi ibk ibo ibp ibs ibt ica icb icc ice ici ick ico icp ics ict ie- iea iec iee iei iek iep ies iet iia iib iic iie iii iio iip iis iit ika ikb ikc ike iki ikk iko iks ikt io- ioa iob ioc ioe ioi ioo iop ios iot ipa ipb ipc ipe ipi ipo ipp ips ipt is- isa isb isc ise isi isk iso isp iss ist ita itb itc ite iti itk ito itp its itt k-t ka- kaa kab kac kae kai kak kao kap kas kat kba kbb kbc kbe kbi kbk kbo kbp kbs kca kcb kcc kce kci kck kcp kcs kct ke- kea keb kec kee kei kek keo kep kes ket kia kib kic kie kii kik kio kip kis kit kkb kkc kke kki kkk kkp kks kkt koa kob koc koe koi kok koo kop kos kot kpa kpc kpe kpi kpk kpo kpp kps kpt ksa ksb ksc kse ksi ksk kso ksp kss kst kta ktb ktc kte ktk kto ktp kts ktt o-i oaa oab oac oae oai oak oao oap oas oat ob- oba obb obc obe obi obk obo obp obs obt oc- oca ocb occ oci ock oco ocp ocs oct oea oeb oec oee oei oeo oep oes oet oia oib oic oie oii oik oio oip ois oit oka okb okc oke oki okk oko okp oks oo- ooa oob ooc ooi ook ooo oop oos oot op- opa opb opc ope opi opk opo opp ops opt os- osa osb osc ose osi osk oso osp oss ost ot- ota otb otc ote oti otk oto otp ots ott p-p paa pab pac pae pai pak pao pap pas pat pba pbb pbc pbe pbi pbk pbo pbp pbs pbt pca pcb pcc pce pci pck pco pcp pcs pct pea peb pec pee pei pek peo pep pes pet pia pib pic pie pii pik pio pip pis pit pka pkb pkc pke pki pko pkp pks pkt poa pob poc poe poi pok poo pop pos pot ppa ppb ppc ppe ppi ppk ppo ppp pps ppt ps- psa psb psc pse psi psk pso psp pss pst pt- pta ptb ptc pte pti ptk pto ptp pts ptt saa sab sac sae sai sak sao sap sas sat sba sbb sbc sbe sbi sbk sbo sbp sbs sbt sca scb scc sce sci sck sco scp scs sct se- sea seb sec see sei sek seo sep ses set sia sib sic sie sii sik sio sip sis sit sk- ska skb skc ske ski skk sko skp sks skt soa sob soc soe soi sok soo sop sos sot spa spb spc spe spi spk spo spp sps spt ss- ssa ssb ssc sse ssi ssk sso ssp sss sst sta stb stc ste sti stk sto stp sts stt taa tab tac tae tai tak tao tap tas tat tba tbb tbc tbe tbi tbk tbo tbp tbs tbt tca tcb tcc tce tci tck tco tcp tcs tct te- tea teb tec tee tei tek teo tep tes tet tia tib tic tie tii tik tio tip tis tit tka tkb tkc tke tkk tko tkp tks tkt to- toa tob toc toe toi tok too top tos tot tpa tpb tpc tpe tpi tpk tpo tpp tps tpt tsa tsb tsc tse tsi