-er -th bbb bbc bbe bbg bbh bbr bbt bcb bcc bce bcg bch bcr bct be- beb bec bee beg beh ber bet bgb bgc bge bgg bgh bgr bgt bhb bhc bhe bhg bhh bhr bht brb bre brg brh brr brt btb btc bte btg bth btr btt c-- cbb cbc cbe cbg cbh cbr cbt ccb ccc cce ccg cch ccr cct ce- ceb cec cee ceg ceh cer cet cgb cgc cge cgg cgh cgr cgt ch- chb chc che chg chh chr cht crb crc cre crg crh crr crt ctb ctc cte ctg cth ctr ctt ebb ebc ebe ebg ebh ebr ebt ec- ecb ecc ece ecg ech ecr ect eeb eec eee eeg eer eet egb egc ege egg egh egr egt ehb ehc ehe ehg ehh ehr eht erb erc ere erg erh err ert etb etc ete etg eth etr ett gbc gbe gbg gbh gbr gbt gcb gcc gce gcg gch gcr gct ge- geb gec gee geg geh ger get ggb ggc ggg ggh ggr ggt ghb ghc ghe ghg ghh ghr ght grb grc gre grg grh grr grt gtb gtc gte gtg gth gtr gtt hbb hbc hbe hbg hbh hbr hbt hcb hcc hce hcg hch hcr hct he- heb hec hee heg heh her het hgb hgc hge hgg hgh hgr hgt hhb hhc hhe hhg hhh hhr hht hr- hrb hrc hre hrg hrh hrr hrt htb htc hte htg hth htr htt rbb rbc rbe rbg rbh rbr rbt rcb rcc rce rcg rch rcr rct re- reb rec ree reg reh rer ret rgb rgc rge rgg rgh rgr rgt rh- rhb rhc rhe rhg rhh rhr rht rrb rrc rrg rrh rrr rrt rtb rtc rte rtg rtr rtt tbb tbc tbe tbg tbh tbr tbt tcb tcc tce tcg tch tcr tct te- teb tec tee teg teh ter tet tgb tgc tge tgg tgh tgr tgt th- thb thc the thg thh thr tht trb trc tre trg trh trr trt ttb ttc tte ttg tth ttr ttt