a-a a-b a-c aaa aab aac aak aam aan aap aar ab- aba abb abc abk abm abn abp abr ac- aca acb acc ack acm acn acp acr aka akb akc akk akm akn akp akr ama amb amc amk amm amn amp amr an- ana anb anc ank anm ann anp anr ap- apa apb apc apk apm apn app apr ar- ara arb arc ark arm arn arp arr b-p baa bab bac bak bam ban bap bar bba bbb bbc bbk bbm bbn bbp bbr bca bcb bcc bck bcm bcn bcp bcr bka bkb bkc bkk bkm bkn bkp bkr bma bmb bmc bmk bmm bmn bmp bmr bna bnb bnc bnk bnn bnp bnr bpa bpb bpc bpm bpn bpp bpr bra brb brk brm brn brp brr c-- caa cab cac cak cam can cap car cba cbb cbc cbk cbm cbn cbp cbr cca ccb ccc cck ccm ccn ccp ccr cka ckb ckc ckm cma cmb cmc cmk cmm cmn cmp cmr cn- cna cnb cnc cnm cnn cnp cnr cpa cpb cpc cpk cpm cpn cpp cpr cra crb crc crk crm crn crp crr ka- kaa kab kac kak kam kan kap kar kba kbb kbc kbk kbm kbn kbp kbr kca kcb kcc kck kcm kcn kcp kcr kkb kkc kkk kkm kkn kkp kkr kma kmb kmc kmk kmm kmp kn- kna knc knk knm knn knp knr kpa kpc kpk kpm kpn kpp kpr kra krc krk krn krp krr m-r maa mab mac mak mam man map mar mba mbb mbc mbk mbm mbp mbr mc- mca mcb mcc mck mcm mcn mcp mcr mka mkb mkc mkk mkm mkn mkp mkr mma mmb mmc mmk mmm mmn mmp mmr mna mnb mnc mnk mnm mnn mnp mnr mpa mpb mpc mpk mpm mpn mpp mpr mra mrb mrc mrk mrm mrn mrp mrr naa nab nac nak nam nan nap nar nba nbb nbc nbk nbm nbn nbp nbr nca ncb ncc nck ncm ncn ncp ncr nka nkc nkk nkm nkn nkp nkr nma nmb nmc nmk nmm nmn nmp nmr nna nnb nnc nnk nnm nnn nnp npa npb npc npm npn npp npr nra nrb nrc nrk nrm nrn nrp nrr p-p paa pab pac pak pam pan pap par pba pbb pbc pbk pbm pbn pbp pbr pca pcb pcc pck pcm pcn pcp pcr pka pkb pkc pkm pkn pkp pkr pma pmb pmc pmk pmm pmn pmp pmr pn- pna pnb pnc pnk pnm pnn pnp pnr ppa ppb ppc ppk ppm ppn ppp ppr pra prb prc prk prm prn prp prr ra- raa rab rac rak ram ran rap rar rba rbb rbc rbk rbm rbn rbp rbr rca rcb rcc rcm rcn rcp rcr rkb rkc rkk rkm rkp rma rmb rmc rmm rmn rmp rmr rna rnb rnc rnm rnn rnp rnr rpa rpb rpc rpk rpm rpn rpp rpr rra rrb rrc rrk rrm rrn rrp rrr