-er -ol b-u bbb bbc bbe bbl bbn bbo bbr bbu bcb bcc bce bcl bcn bco bcr bcu be- beb bec bee bel ben beo ber beu blb blc ble bll bln blo blr blu bnb bnc bne bnl bnn bno bnr bnu bob boc boe bol bon boo bor bou brb bre brl brn bro brr bru bub buc bue bul bun buo bur buu c-- cbb cbc cbe cbl cbn cbo cbr cbu ccb ccc cce ccl ccn cco ccr ccu ce- ceb cec cee cel cen ceo cer ceu cl- clb clc cle cll cln clo clr clu cn- cnb cnc cne cnl cnn cno cnr cnu co- cob coc coe col con coo cor cou crb crc cre crl crn cro crr cru cub cuc cue cul cun cuo cur cuu ebb ebc ebe ebl ebn ebo ebr ebu ec- ecb ecc ece ecl ecn eco ecr ecu eeb eec eee eel een eeo eer elb elc ele ell eln elo elr elu en- enb enc ene enl enn eno enr enu eo- eob eoc eoe eol eon eoo eor eou erb erc ere erl ern ero err eru eu- eub euc eue eul eun eur lbb lbc lbe lbl lbo lbr lbu lcb lcc lce lcl lcn lco lcr lcu leb lec lee lel len leo ler leu llb llc lle lll lln llo llr llu lnb lnc lne lnl lnn lno lnr lnu lob loc loe lol lon loo lor lou lrb lrc lrn lro lrr lru lub luc lue lul lun luo lur luu nbb nbc nbe nbl nbn nbo nbr nbu ncb ncc nce ncl ncn nco ncr ncu ne- neb nec nee nel nen neo ner neu nlb nlc nle nll nln nlo nlr nlu nnb nnc nne nnl nnn nno nnu no- nob noc noe nol non noo nor nou nrb nrc nre nrl nrn nro nrr nru nub nuc nue nul nun nuo nur nuu ob- obb obc obe obl obn obo obr obu oc- ocb occ ocl ocn oco ocr ocu oeb oec oee oel oen oeo oer olb olc ole oll oln olo olu on- onb onc one onl onn ono onr onu oo- oob ooc ool oon ooo oor or- orb orc ore orl orn oro orr oru ou- ouc oue oul oun ouo our rbb rbc rbe rbl rbn rbo rbr rbu rcb rcc rce rcl rcn rco rcr rcu re- reb rec ree rel ren reo rer reu rlc rle rll rln rlo rlr rlu rnb rnc rnn rno rnr rnu rob roc roe rol ron roo ror rou rrb rrc rrl rrn rrr rru rub ruc rue run ruo rur ruu ubb ubc ube ubl ubn ubo ubr ubu ucb ucc uce ucl ucn uco ucr ucu ueb uec uee uel uen uer ulb ulc ule ull uln ulo ulr ulu un- unb unc une unl unn uno unr unu uob uoc uoe uol uon uoo uor ur- urb urc ure url urn uro urr uru uuc uue uun uur uuu