a-a a-b aaa aab aae aam aap ab- aba abb abe abm abp aea aeb aee aem aep ama amb ame amm amp ap- apa apb ape apm app b-p baa bab bae bam bap bba bbb bbe bbm bbp be- bea beb bee bem bep bma bmb bme bmm bmp bpa bpb bpe bpm bpp eaa eab eae eam eap eba ebb ebe ebm ebp eea eeb eee eem eep em- ema emb eme emm emp ep- epa epb epe epm epp maa mab mae mam map mba mbb mbe mbm mbp mea meb mee mem mep mma mmb mme mmm mmp mpa mpb mpe mpm mpp p-p paa pab pae pam pap pba pbb pbe pbm pbp pea peb pee pem pep pma pmb pme pmm pmp ppa ppb ppe ppm ppp