-er bbb bbc bbe bbk bbm bbr bcb bcc bce bck bcm bcr be- beb bec bee bek bem ber bkb bkc bke bkk bkm bkr bmb bmc bme bmk bmm bmr brb bre brk brm brr c-- cbb cbc cbe cbk cbm cbr ccb ccc cce cck ccm ccr ce- ceb cec cee cek cem cer ckb ckc ckm cmb cmc cme cmk cmm cmr crb crc cre crk crm crr ebb ebc ebe ebk ebm ebr ec- ecb ecc ece eck ecm ecr eeb eec eee eek eem eer ekb ekc eke ekr em- emb emc eme emk emm emr erb erc ere erk erm err kbb kbc kbe kbk kbm kbr kcb kcc kce kck kcm kcr ke- keb kec kee kek kem ker kkb kkc kke kkk kkm kkr kmb kmc kme kmk kmm krc krk krr m-r mbb mbc mbe mbk mbm mbr mc- mcb mcc mce mck mcm mcr meb mec mee mek mem mer mkb mkc mke mkk mkm mkr mmb mmc mme mmk mmm mmr mrb mrc mre mrk mrm mrr rbb rbc rbe rbk rbm rbr rcb rcc rce rcm rcr re- reb rec ree rek rem rer rkb rkc rke rkk rkm rmb rmc rme rmm rmr rrb rrc rrk rrm rrr