a-a a-b aaa aab aae aam aap aas ab- aba abb abe abm abp abs aea aeb aee aem aep aes ama amb ame amm amp ams ap- apa apb ape apm app aps as- asa asb ase asm asp ass b-p baa bab bae bam bap bas bba bbb bbe bbm bbp bbs be- bea beb bee bem bep bes bma bmb bme bmm bmp bms bpa bpb bpe bpm bpp bps bsa bsb bse bsm bsp bss eaa eab eae eam eap eas eba ebb ebe ebm ebp ebs eea eeb eee eem eep ees em- ema emb eme emm emp ems ep- epa epb epe epm epp eps es- esa esb ese esm esp ess maa mab mae mam map mas mba mbb mbe mbm mbp mbs mea meb mee mem mep mes mma mmb mme mmm mmp mms mpa mpb mpe mpm mpp mps msa msb mse msm msp mss p-p paa pab pae pam pap pas pba pbb pbe pbm pbp pbs pea peb pee pem pep pes pma pmb pme pmm pmp pms ppa ppb ppe ppm ppp pps ps- psa psb pse psm psp pss saa sab sae sam sap sas sba sbb sbe sbm sbp sbs se- sea seb see sem sep ses sma smb sme smm smp sms spa spb spe spm spp sps ss- ssa ssb sse ssm ssp sss