a-a a-b a-c aaa aab aac aak aam aap aar ab- aba abb abc abk abm abp abr ac- aca acb acc ack acm acp acr aka akb akc akk akm akp akr ama amb amc amk amm amp amr ap- apa apb apc apk apm app apr ar- ara arb arc ark arm arp arr b-p baa bab bac bak bam bap bar bba bbb bbc bbk bbm bbp bbr bca bcb bcc bck bcm bcp bcr bka bkb bkc bkk bkm bkp bkr bma bmb bmc bmk bmm bmp bmr bpa bpb bpc bpm bpp bpr bra brb brk brm brp brr c-- caa cab cac cak cam cap car cba cbb cbc cbk cbm cbp cbr cca ccb ccc cck ccm ccp ccr cka ckb ckc ckm cma cmb cmc cmk cmm cmp cmr cpa cpb cpc cpk cpm cpp cpr cra crb crc crk crm crp crr ka- kaa kab kac kak kam kap kar kba kbb kbc kbk kbm kbp kbr kca kcb kcc kck kcm kcp kcr kkb kkc kkk kkm kkp kkr kma kmb kmc kmk kmm kmp kpa kpc kpk kpm kpp kpr kra krc krk krp krr m-r maa mab mac mak mam map mar mba mbb mbc mbk mbm mbp mbr mc- mca mcb mcc mck mcm mcp mcr mka mkb mkc mkk mkm mkp mkr mma mmb mmc mmk mmm mmp mmr mpa mpb mpc mpk mpm mpp mpr mra mrb mrc mrk mrm mrp mrr p-p paa pab pac pak pam pap par pba pbb pbc pbk pbm pbp pbr pca pcb pcc pck pcm pcp pcr pka pkb pkc pkm pkp pkr pma pmb pmc pmk pmm pmp pmr ppa ppb ppc ppk ppm ppp ppr pra prb prc prk prm prp prr ra- raa rab rac rak ram rap rar rba rbb rbc rbk rbm rbp rbr rca rcb rcc rcm rcp rcr rkb rkc rkk rkm rkp rma rmb rmc rmm rmp rmr rpa rpb rpc rpk rpm rpp rpr rra rrb rrc rrk rrm rrp rrr