a-a a-b a-c aaa aab aac aam aap aar ab- aba abb abc abm abp abr ac- aca acb acc acm acp acr ama amb amc amm amp amr ap- apa apb apc apm app apr ar- ara arb arc arm arp arr b-p baa bab bac bam bap bar bba bbb bbc bbm bbp bbr bca bcb bcc bcm bcp bcr bma bmb bmc bmm bmp bmr bpa bpb bpc bpm bpp bpr bra brb brm brp brr c-- caa cab cac cam cap car cba cbb cbc cbm cbp cbr cca ccb ccc ccm ccp ccr cma cmb cmc cmm cmp cmr cpa cpb cpc cpm cpp cpr cra crb crc crm crp crr m-r maa mab mac mam map mar mba mbb mbc mbm mbp mbr mc- mca mcb mcc mcm mcp mcr mma mmb mmc mmm mmp mmr mpa mpb mpc mpm mpp mpr mra mrb mrc mrm mrp mrr p-p paa pab pac pam pap par pba pbb pbc pbm pbp pbr pca pcb pcc pcm pcp pcr pma pmb pmc pmm pmp pmr ppa ppb ppc ppm ppp ppr pra prb prc prm prp prr ra- raa rab rac ram rap rar rba rbb rbc rbm rbp rbr rca rcb rcc rcm rcp rcr rma rmb rmc rmm rmp rmr rpa rpb rpc rpm rpp rpr rra rrb rrc rrm rrp rrr