-er b-u bbb bbc bbe bbl bbm bbr bbu bcb bcc bce bcl bcm bcr bcu be- beb bec bee bel bem ber beu blb blc ble bll blm blr blu bmb bmc bme bml bmm bmr bmu brb bre brl brm brr bru bub buc bue bul bum bur buu c-- cbb cbc cbe cbl cbm cbr cbu ccb ccc cce ccl ccm ccr ccu ce- ceb cec cee cel cem cer ceu cl- clb clc cle cll clm clr clu cmb cmc cme cml cmm cmr cmu crb crc cre crl crm crr cru cub cuc cue cul cum cur cuu ebb ebc ebe ebl ebm ebr ebu ec- ecb ecc ece ecl ecm ecr ecu eeb eec eee eel eem eer elb elc ele ell elm elr elu em- emb emc eme eml emm emr emu erb erc ere erl erm err eru eu- eub euc eue eul eur lbb lbc lbe lbl lbm lbr lbu lcb lcc lce lcl lcm lcr lcu leb lec lee lel lem ler leu llb llc lle lll llm llr llu lmb lmc lme lml lmm lmr lmu lrb lrc lrm lrr lru lub luc lue lul lum lur luu m-r mbb mbc mbe mbl mbm mbr mbu mc- mcb mcc mce mcl mcm mcr mcu meb mec mee mel mem mer meu mlb mlc mle mll mlm mlr mlu mmb mmc mme mml mmm mmr mmu mrb mrc mre mrl mrm mrr mru mub muc mue mul mum mur muu rbb rbc rbe rbl rbm rbr rbu rcb rcc rce rcl rcm rcr rcu re- reb rec ree rel rem rer reu rlc rle rll rlm rlr rlu rmb rmc rme rml rmm rmr rrb rrc rrl rrm rrr rru rub ruc rue rum rur ruu ubb ubc ube ubl ubr ubu ucb ucc uce ucl ucm ucr ucu ueb uec uee uel uem uer ulb ulc ule ull ulm ulr ulu um- umb umc ume uml umm umr umu ur- urb urc ure url urm urr uru uuc uue uum uur uuu