-er a-a a-b a-c aaa aab aac aae aak aam aap aar ab- aba abb abc abe abk abm abp abr ac- aca acb acc ace ack acm acp acr aea aeb aec aee aek aem aep aer aka akb akc ake akk akm akp akr ama amb amc ame amk amm amp amr ap- apa apb apc ape apk apm app apr ar- ara arb arc are ark arm arp arr b-p baa bab bac bae bak bam bap bar bba bbb bbc bbe bbk bbm bbp bbr bca bcb bcc bce bck bcm bcp bcr be- bea beb bec bee bek bem bep ber bka bkb bkc bke bkk bkm bkp bkr bma bmb bmc bme bmk bmm bmp bmr bpa bpb bpc bpe bpm bpp bpr bra brb bre brk brm brp brr c-- caa cab cac cae cak cam cap car cba cbb cbc cbe cbk cbm cbp cbr cca ccb ccc cce cck ccm ccp ccr ce- cea ceb cec cee cek cem cep cer cka ckb ckc ckm cma cmb cmc cme cmk cmm cmp cmr cpa cpb cpc cpe cpk cpm cpp cpr cra crb crc cre crk crm crp crr eaa eab eac eae eak eam eap ear eba ebb ebc ebe ebk ebm ebp ebr ec- eca ecb ecc ece eck ecm ecr eea eeb eec eee eek eem eep eer eka ekb ekc eke ekp ekr em- ema emb emc eme emk emm emp emr ep- epa epb epc epe epm epp epr era erb erc ere erk erm erp err ka- kaa kab kac kae kak kam kap kar kba kbb kbc kbe kbk kbm kbp kbr kca kcb kcc kce kck kcm kcp kcr ke- kea keb kec kee kek kem kep ker kkb kkc kke kkk kkm kkp kkr kma kmb kmc kme kmk kmm kmp kpa kpc kpe kpk kpm kpp kpr kra krc krk krp krr m-r maa mab mac mae mak mam map mar mba mbb mbc mbe mbk mbm mbp mbr mc- mca mcb mcc mce mck mcm mcp mcr mea meb mec mee mek mem mep mer mka mkb mkc mke mkk mkm mkp mkr mma mmb mmc mme mmk mmm mmp mmr mpa mpb mpc mpe mpk mpm mpp mpr mra mrb mrc mre mrk mrm mrp mrr p-p paa pab pac pae pak pam pap par pba pbb pbc pbe pbk pbm pbp pbr pca pcb pcc pce pck pcm pcp pcr pea peb pec pee pek pem pep per pka pkb pkc pke pkm pkp pkr pma pmb pmc pme pmk pmm pmp pmr ppa ppb ppc ppe ppk ppm ppp ppr pra prb prc pre prk prm prp prr ra- raa rab rac rae rak ram rap rar rba rbb rbc rbe rbk rbm rbp rbr rca rcb rcc rce rcm rcp rcr re- rea reb rec ree rek rem rep rer rkb rkc rke rkk rkm rkp rma rmb rmc rme rmm rmp rmr rpa rpb rpc rpe rpk rpm rpp rpr rra rrb rrc rrk rrm rrp rrr