-er b-u bbb bbc bbe bbl bbn bbr bbu bcb bcc bce bcl bcn bcr bcu be- beb bec bee bel ben ber beu blb blc ble bll bln blr blu bnb bnc bne bnl bnn bnr bnu brb bre brl brn brr bru bub buc bue bul bun bur buu c-- cbb cbc cbe cbl cbn cbr cbu ccb ccc cce ccl ccn ccr ccu ce- ceb cec cee cel cen cer ceu cl- clb clc cle cll cln clr clu cn- cnb cnc cne cnl cnn cnr cnu crb crc cre crl crn crr cru cub cuc cue cul cun cur cuu ebb ebc ebe ebl ebn ebr ebu ec- ecb ecc ece ecl ecn ecr ecu eeb eec eee eel een eer elb elc ele ell eln elr elu en- enb enc ene enl enn enr enu erb erc ere erl ern err eru eu- eub euc eue eul eun eur lbb lbc lbe lbl lbr lbu lcb lcc lce lcl lcn lcr lcu leb lec lee lel len ler leu llb llc lle lll lln llr llu lnb lnc lne lnl lnn lnr lnu lrb lrc lrn lrr lru lub luc lue lul lun lur luu nbb nbc nbe nbl nbn nbr nbu ncb ncc nce ncl ncn ncr ncu ne- neb nec nee nel nen ner neu nlb nlc nle nll nln nlr nlu nnb nnc nne nnl nnn nnu nrb nrc nre nrl nrn nrr nru nub nuc nue nul nun nur nuu rbb rbc rbe rbl rbn rbr rbu rcb rcc rce rcl rcn rcr rcu re- reb rec ree rel ren rer reu rlc rle rll rln rlr rlu rnb rnc rnn rnr rnu rrb rrc rrl rrn rrr rru rub ruc rue run rur ruu ubb ubc ube ubl ubn ubr ubu ucb ucc uce ucl ucn ucr ucu ueb uec uee uel uen uer ulb ulc ule ull uln ulr ulu un- unb unc une unl unn unr unu ur- urb urc ure url urn urr uru uuc uue uun uur uuu