-er -ol b-u bbb bbc bbe bbl bbo bbr bbt bbu bcb bcc bce bcl bco bcr bct bcu be- beb bec bee bel beo ber bet beu blb blc ble bll blo blr blt blu bob boc boe bol boo bor bot bou brb bre brl bro brr brt bru btb btc bte btl bto btr btt btu bub buc bue bul buo bur but buu c-- cbb cbc cbe cbl cbo cbr cbt cbu ccb ccc cce ccl cco ccr cct ccu ce- ceb cec cee cel ceo cer cet ceu cl- clb clc cle cll clo clr clt clu co- cob coc coe col coo cor cot cou crb crc cre crl cro crr crt cru ctb ctc cte ctl cto ctr ctt ctu cub cuc cue cul cuo cur cut cuu ebb ebc ebe ebl ebo ebr ebt ebu ec- ecb ecc ece ecl eco ecr ect ecu eeb eec eee eel eeo eer eet elb elc ele ell elo elr elt elu eo- eob eoc eoe eol eoo eor eot eou erb erc ere erl ero err ert eru etb etc ete etl eto etr ett etu eu- eub euc eue eul eur eut lbb lbc lbe lbl lbo lbr lbt lbu lcb lcc lce lcl lco lcr lct lcu leb lec lee lel leo ler let leu llb llc lle lll llo llr llt llu lob loc loe lol loo lor lot lou lrb lrc lro lrr lrt lru ltb ltc lte ltl lto ltr ltt ltu lub luc lue lul luo lur lut luu ob- obb obc obe obl obo obr obt obu oc- ocb occ ocl oco ocr oct ocu oeb oec oee oel oeo oer oet olb olc ole oll olo olt olu oo- oob ooc ool ooo oor oot or- orb orc ore orl oro orr ort oru ot- otb otc ote otl oto otr ott otu ou- ouc oue oul ouo our out rbb rbc rbe rbl rbo rbr rbt rbu rcb rcc rce rcl rco rcr rct rcu re- reb rec ree rel reo rer ret reu rlc rle rll rlo rlr rlt rlu rob roc roe rol roo ror rot rou rrb rrc rrl rrr rrt rru rtb rtc rte rtl rto rtr rtt rtu rub ruc rue ruo rur rut ruu tbb tbc tbe tbl tbo tbr tbt tbu tcb tcc tce tcl tco tcr tct tcu te- teb tec tee tel teo ter tet teu tlc tle tll tlo tlr tlt tlu to- tob toc toe tol too tor tot tou trb trc tre trl tro trr trt tru ttb ttc tte ttl tto ttr ttt ttu tub tuc tue tul tuo tur tut tuu ubb ubc ube ubl ubo ubr ubt ubu ucb ucc uce ucl uco ucr uct ucu ueb uec uee uel uer uet ulb ulc ule ull ulo ulr ult ulu uob uoc uoe uol uoo uor uot ur- urb urc ure url uro urr urt uru utb utc ute utl uto utr utt utu uuc uue uur uut uuu