a-a a-b a-c aaa aab aac aam aap ab- aba abb abc abm abp ac- aca acb acc acm acp ama amb amc amm amp ap- apa apb apc apm app b-p baa bab bac bam bap bba bbb bbc bbm bbp bca bcb bcc bcm bcp bma bmb bmc bmm bmp bpa bpb bpc bpm bpp c-- caa cab cac cam cap cba cbb cbc cbm cbp cca ccb ccc ccm ccp cma cmb cmc cmm cmp cpa cpb cpc cpm cpp maa mab mac mam map mba mbb mbc mbm mbp mc- mca mcb mcc mcm mcp mma mmb mmc mmm mmp mpa mpb mpc mpm mpp p-p paa pab pac pam pap pba pbb pbc pbm pbp pca pcb pcc pcm pcp pma pmb pmc pmm pmp ppa ppb ppc ppm ppp