a-a a-b a-c aaa aab aac aae aap aas ab- aba abb abc abe abp abs ac- aca acb acc ace acp acs aea aeb aec aee aep aes ap- apa apb apc ape app aps as- asa asb asc ase asp ass b-p baa bab bac bae bap bas bba bbb bbc bbe bbp bbs bca bcb bcc bce bcp bcs be- bea beb bec bee bep bes bpa bpb bpc bpe bpp bps bsa bsb bsc bse bsp bss c-- caa cab cac cae cap cas cba cbb cbc cbe cbp cbs cca ccb ccc cce ccp ccs ce- cea ceb cec cee cep ces cpa cpb cpc cpe cpp cps csa csb csc cse csp css eaa eab eac eae eap eas eba ebb ebc ebe ebp ebs ec- eca ecb ecc ece ecs eea eeb eec eee eep ees ep- epa epb epc epe epp eps es- esa esb esc ese esp ess p-p paa pab pac pae pap pas pba pbb pbc pbe pbp pbs pca pcb pcc pce pcp pcs pea peb pec pee pep pes ppa ppb ppc ppe ppp pps ps- psa psb psc pse psp pss saa sab sac sae sap sas sba sbb sbc sbe sbp sbs sca scb scc sce scp scs se- sea seb sec see sep ses spa spb spc spe spp sps ss- ssa ssb ssc sse ssp sss