a-a a-b a-c aaa aab aac aad aae aak aap ab- aba abb abc abd abe abk abp ac- aca acb acc acd ace ack acp ad- ada adb adc add ade adk adp aea aeb aec aed aee aek aep aka akb akc akd ake akk akp ap- apa apb apc apd ape apk app b-p baa bab bac bad bae bak bap bba bbb bbc bbd bbe bbk bbp bca bcb bcc bcd bce bck bcp bda bdb bdc bdd bde bdk bdp be- bea beb bec bed bee bek bep bka bkb bkc bke bkk bkp bpa bpb bpc bpd bpe bpp c-- caa cab cac cad cae cak cap cba cbb cbc cbd cbe cbk cbp cca ccb ccc ccd cce cck ccp cda cdb cdc cdd cde cdk cdp ce- cea ceb cec ced cee cek cep cka ckb ckc ckd cpa cpb cpc cpd cpe cpk cpp daa dab dac dad dae dak dap dba dbb dbc dbd dbe dbk dbp dca dcb dcc dcd dce dck dcp dda ddb ddc ddd dde ddk ddp de- dea deb dec ded dee dek dep dka dkb dkc dke dkk dkp dpa dpb dpc dpd dpe dpk dpp eaa eab eac ead eae eak eap eba ebb ebc ebd ebe ebk ebp ec- eca ecb ecc ecd ece eck ed- eda edb edc edd ede edk edp eea eeb eec eed eee eek eep eka ekb ekc ekd eke ekp ep- epa epb epc epd epe epp ka- kaa kab kac kad kae kak kap kba kbb kbc kbd kbe kbk kbp kca kcb kcc kcd kce kck kcp kda kdb kdc kde kdk kdp ke- kea keb kec ked kee kek kep kkb kkc kke kkk kkp kpa kpc kpd kpe kpk kpp p-p paa pab pac pad pae pak pap pba pbb pbc pbd pbe pbk pbp pca pcb pcc pcd pce pck pcp pda pdb pdc pdd pde pdk pdp pea peb pec ped pee pek pep pka pkb pkc pkd pke pkp ppa ppb ppc ppd ppe ppk ppp