-ic a-a a-b a-c a-i a-t aaa aab aac aae aai aak aap aat aax ab- aba abb abc abe abi abk abp abt abx ac- aca acb acc ace aci ack acp act acx aea aeb aec aee aei aek aep aet aex ai- aia aib aic aie aii aik aip ait aix aka akb akc ake aki akk akp ap- apa apb apc ape api apk app apt apx at- ata atb atc ate ati atp att atx ax- axa axe axi axk axp axt axx b-p baa bab bac bae bai bak bap bat bax bba bbb bbc bbe bbi bbk bbp bbt bbx bca bcb bcc bce bci bck bcp bct bcx be- bea beb bec bee bei bek bep bet bex bi- bia bib bic bie bii bik bip bit bix bka bkb bkc bke bkk bkp bkt bkx bpa bpb bpc bpe bpi bpp bpt bpx bta btb btc bte bti btk btp btt btx bxb bxi bxx c-- caa cab cac cae cai cak cap cat cax cba cbb cbc cbe cbi cbk cbp cbt cbx cca ccb ccc cce cci cck ccp cct ccx ce- cea ceb cec cee cei cek cep cet cex ci- cia cib cic cie cii cik cip cit cix cka ckb ckc cki ckt ckx cpa cpb cpc cpe cpi cpk cpp cpt cpx cta ctb ctc cte cti ctk ctp ctt ctx cxc cxi cxk cxp cxt cxx eaa eab eac eae eai eak eap eat eax eba ebb ebc ebe ebi ebk ebp ebt ebx ec- eca ecb ecc ece eci eck ect ecx eea eeb eec eee eek eep eet eex eia eib eic eie eii eik eip eit eix eka ekb ekc eke eki ekp ekt ep- epa epb epc epe epi epp ept epx eta etb etc ete eti etk etp ett etx ex- exa exc exe exi exp ext exx ia- iaa iab iac iae iai iap iat iba ibb ibc ibe ibi ibk ibp ibt ibx ica icb icc ice ici ick icp ict ie- iea iec iee iei iek iep iet iex iia iib iic iie iii iip iit iix ika ikb ikc ike iki ikk ikt ikx ipa ipb ipc ipe ipi ipp ipt ipx ita itb itc ite iti itk itp itt itx ixc ixe ixi k-t ka- kaa kab kac kae kai kak kap kat kax kba kbb kbc kbe kbi kbk kbp kbx kca kcb kcc kce kci kck kcp kct kcx ke- kea keb kec kee kei kek kep ket kex kia kib kic kie kii kik kip kit kix kkb kkc kke kki kkk kkp kkt kpa kpc kpe kpi kpk kpp kpt kta ktb ktc kte ktk ktp ktt p-p paa pab pac pae pai pak pap pat pax pba pbb pbc pbe pbi pbk pbp pbt pbx pca pcb pcc pce pci pck pcp pct pcx pea peb pec pee pei pek pep pet pex pia pib pic pie pii pik pip pit pix pka pkb pkc pke pki pkp pkt ppa ppb ppc ppe ppi ppk ppp ppt ppx pt- pta ptb ptc pte pti ptk ptp ptt ptx pxc pxe pxk pxt t-x taa tab tac tae tai tak tap tat tax tba tbb tbc tbe tbi tbk tbp tbt tca tcb tcc tce tci tck tcp tct tcx te- tea teb tec tee tei tek tep tet tex tia tib tic tie tii tik tip tit tix tka tkb tkc tke tkk tkp tkt tpa tpb tpc tpe tpi tpk tpp tpt tpx tta ttb ttc tte tti ttk ttp ttt ttx txe txi txk txt xaa xac xak xap xat xbc xbe xbx xcb xci xcp xcx xee xep xet xex xia xic xie xii xit xix xkb xke xpa xpb xpc xpe xpp xpt xtc xti xtp xtx xxi xxp xxx