-er -th bbb bbc bbe bbh bbo bbr bbt bcb bcc bce bch bco bcr bct be- beb bec bee beh beo ber bet bhb bhc bhe bhh bho bhr bht bob boc boe boh boo bor bot brb bre brh bro brr brt btb btc bte bth bto btr btt c-- cbb cbc cbe cbh cbo cbr cbt ccb ccc cce cch cco ccr cct ce- ceb cec cee ceh ceo cer cet ch- chb chc che chh cho chr cht co- cob coc coe coh coo cor cot crb crc cre crh cro crr crt ctb ctc cte cth cto ctr ctt ebb ebc ebe ebh ebo ebr ebt ec- ecb ecc ece ech eco ecr ect eeb eec eee eeo eer eet ehb ehc ehe ehh eho ehr eht eo- eob eoc eoe eoh eoo eor eot erb erc ere erh ero err ert etb etc ete eth eto etr ett hbb hbc hbe hbh hbo hbr hbt hcb hcc hce hch hco hcr hct he- heb hec hee heh heo her het hhb hhc hhe hhh hho hhr hht hob hoc hoe hoh hoo hor hot hr- hrb hrc hre hrh hro hrr hrt htb htc hte hth hto htr htt ob- obb obc obe obh obo obr obt oc- ocb occ och oco ocr oct oeb oec oee oeh oeo oer oet ohc ohe ohh oho ohr oht oo- oob ooc ooh ooo oor oot or- orb orc ore orh oro orr ort ot- otb otc ote oth oto otr ott rbb rbc rbe rbh rbo rbr rbt rcb rcc rce rch rco rcr rct re- reb rec ree reh reo rer ret rh- rhb rhc rhe rhh rho rhr rht rob roc roe roh roo ror rot rrb rrc rrh rrr rrt rtb rtc rte rto rtr rtt tbb tbc tbe tbh tbo tbr tbt tcb tcc tce tch tco tcr tct te- teb tec tee teh teo ter tet th- thb thc the thh tho thr tht to- tob toc toe toh too tor tot trb trc tre trh tro trr trt ttb ttc tte tth tto ttr ttt