a-a a-b aaa aab aad aae aap aas ab- aba abb abd abe abp abs ad- ada adb add ade adp ads aea aeb aed aee aep aes ap- apa apb apd ape app aps as- asa asb asd ase asp ass b-p baa bab bad bae bap bas bba bbb bbd bbe bbp bbs bda bdb bdd bde bdp bds be- bea beb bed bee bep bes bpa bpb bpd bpe bpp bps bsa bsb bsd bse bsp bss daa dab dad dae dap das dba dbb dbd dbe dbp dbs dda ddb ddd dde ddp dds de- dea deb ded dee dep des dpa dpb dpd dpe dpp dps dsa dsb dsd dse dsp dss eaa eab ead eae eap eas eba ebb ebd ebe ebp ebs ed- eda edb edd ede edp eds eea eeb eed eee eep ees ep- epa epb epd epe epp eps es- esa esb esd ese esp ess p-p paa pab pad pae pap pas pba pbb pbd pbe pbp pbs pda pdb pdd pde pdp pds pea peb ped pee pep pes ppa ppb ppd ppe ppp pps ps- psa psb psd pse psp pss saa sab sad sae sap sas sba sbb sbd sbe sbp sbs sda sdb sdd sde sdp sds se- sea seb sed see sep ses spa spb spd spe spp sps ss- ssa ssb ssd sse ssp sss