-al -er a-a a-b a-c aaa aab aac aae aak aal aam aar ab- aba abb abc abe abk abl abm abr ac- aca acb acc ace ack acl acm acr aea aeb aec aee aek ael aem aer aka akb akc ake akk akl akm akr al- ala alb alc ale alk all alm alr ama amb amc ame amk aml amm amr ar- ara arb arc are ark arl arm arr baa bab bac bae bak bal bam bar bba bbb bbc bbe bbk bbl bbm bbr bca bcb bcc bce bck bcl bcm bcr be- bea beb bec bee bek bel bem ber bka bkb bkc bke bkk bkl bkm bkr bla blb blc ble blk bll blm blr bma bmb bmc bme bmk bml bmm bmr bra brb bre brk brl brm brr c-- caa cab cac cae cak cal cam car cba cbb cbc cbe cbk cbl cbm cbr cca ccb ccc cce cck ccl ccm ccr ce- cea ceb cec cee cek cel cem cer cka ckb ckc ckm cl- cla clb clc cle clk cll clm clr cma cmb cmc cme cmk cml cmm cmr cra crb crc cre crk crl crm crr eaa eab eac eae eak eal eam ear eba ebb ebc ebe ebk ebl ebm ebr ec- eca ecb ecc ece eck ecl ecm ecr eea eeb eec eee eek eel eem eer eka ekb ekc eke ekl ekr ela elb elc ele elk ell elm elr em- ema emb emc eme emk eml emm emr era erb erc ere erk erl erm err ka- kaa kab kac kae kak kal kam kar kba kbb kbc kbe kbk kbl kbm kbr kca kcb kcc kce kck kcl kcm kcr ke- kea keb kec kee kek kel kem ker kkb kkc kke kkk kkl kkm kkr kl- kla klb klc klm klr kma kmb kmc kme kmk kml kmm kra krc krk krl krr la- laa lab lac lae lak lal lam lar lba lbb lbc lbe lbk lbl lbm lbr lca lcb lcc lce lck lcl lcm lcr lea leb lec lee lek lel lem ler lka lkb lkl lkr lla llb llc lle llk lll llm llr lma lmb lmc lme lmk lml lmm lmr lra lrb lrc lrk lrm lrr m-r maa mab mac mae mak mal mam mar mba mbb mbc mbe mbk mbl mbm mbr mc- mca mcb mcc mce mck mcl mcm mcr mea meb mec mee mek mel mem mer mka mkb mkc mke mkk mkl mkm mkr mla mlb mlc mle mlk mll mlm mlr mma mmb mmc mme mmk mml mmm mmr mra mrb mrc mre mrk mrl mrm mrr ra- raa rab rac rae rak ral ram rar rba rbb rbc rbe rbk rbl rbm rbr rca rcb rcc rce rcl rcm rcr re- rea reb rec ree rek rel rem rer rkb rkc rke rkk rkm rla rlc rle rll rlm rlr rma rmb rmc rme rml rmm rmr rra rrb rrc rrk rrl rrm rrr