-er -th b-u bbb bbc bbe bbh bbo bbr bbt bbu bcb bcc bce bch bco bcr bct bcu be- beb bec bee beh beo ber bet beu bhb bhc bhe bhh bho bhr bht bhu bob boc boe boh boo bor bot bou brb bre brh bro brr brt bru btb btc bte bth bto btr btt btu bub buc bue buh buo bur but buu c-- cbb cbc cbe cbh cbo cbr cbt cbu ccb ccc cce cch cco ccr cct ccu ce- ceb cec cee ceh ceo cer cet ceu ch- chb chc che chh cho chr cht chu co- cob coc coe coh coo cor cot cou crb crc cre crh cro crr crt cru ctb ctc cte cth cto ctr ctt ctu cub cuc cue cuh cuo cur cut cuu ebb ebc ebe ebh ebo ebr ebt ebu ec- ecb ecc ece ech eco ecr ect ecu eeb eec eee eeo eer eet ehb ehc ehe ehh eho ehr eht ehu eo- eob eoc eoe eoh eoo eor eot eou erb erc ere erh ero err ert eru etb etc ete eth eto etr ett etu eu- eub euc eue eur eut hbb hbc hbe hbh hbo hbr hbt hbu hcb hcc hce hch hco hcr hct he- heb hec hee heh heo her het heu hhb hhc hhe hhh hho hhr hht hhu hob hoc hoe hoh hoo hor hot hou hr- hrb hrc hre hrh hro hrr hrt hru htb htc hte hth hto htr htt hub huc hue huh huo hur hut huu ob- obb obc obe obh obo obr obt obu oc- ocb occ och oco ocr oct ocu oeb oec oee oeh oeo oer oet ohc ohe ohh oho ohr oht ohu oo- oob ooc ooh ooo oor oot or- orb orc ore orh oro orr ort oru ot- otb otc ote oth oto otr ott otu ou- ouc oue ouh ouo our out rbb rbc rbe rbh rbo rbr rbt rbu rcb rcc rce rch rco rcr rct rcu re- reb rec ree reh reo rer ret reu rh- rhb rhc rhe rhh rho rhr rht rhu rob roc roe roh roo ror rot rou rrb rrc rrh rrr rrt rru rtb rtc rte rto rtr rtt rtu rub ruc rue ruh ruo rur rut ruu tbb tbc tbe tbh tbo tbr tbt tbu tcb tcc tce tch tco tcr tct tcu te- teb tec tee teh teo ter tet teu th- thb thc the thh tho thr tht thu to- tob toc toe toh too tor tot tou trb trc tre trh tro trr trt tru ttb ttc tte tth tto ttr ttt ttu tub tuc tue tuh tuo tur tut tuu ubb ubc ube ubh ubo ubr ubt ubu ucb ucc uce uch uco ucr uct ucu ueb uec uee ueh uer uet uhb uhc uhe uhh uho uhr uht uhu uob uoc uoe uoo uor uot ur- urb urc ure uro urr urt uru utb utc ute uth uto utr utt utu uuc uue uur uut uuu