-er -th bbb bbc bbe bbh bbn bbr bbs bbt bcb bcc bce bch bcn bcr bcs bct be- beb bec bee beh ben ber bes bet bhb bhc bhe bhh bhr bhs bht bnb bnc bne bnn bnr bns bnt brb bre brh brn brr brs brt bsb bsc bse bsh bsn bsr bss bst btb btc bte bth btn btr bts btt c-- cbb cbc cbe cbh cbn cbr cbs cbt ccb ccc cce cch ccn ccr ccs cct ce- ceb cec cee ceh cen cer ces cet ch- chb chc che chh chn chr chs cht cn- cnb cnc cne cnh cnn cnr cns cnt crb crc cre crh crn crr crs crt csb csc cse csh csn csr css cst ctb ctc cte cth ctn ctr cts ctt ebb ebc ebe ebh ebn ebr ebs ebt ec- ecb ecc ece ech ecn ecr ecs ect eeb eec eee een eer ees eet ehb ehc ehe ehh ehn ehr ehs eht en- enb enc ene enh enn enr ens ent erb erc ere erh ern err ers ert es- esb esc ese esh esn esr ess est etb etc ete eth etn etr ets ett hbb hbc hbe hbh hbn hbr hbs hbt hcb hcc hce hch hcn hcr hcs hct he- heb hec hee heh hen her hes het hhb hhc hhe hhh hhn hhr hhs hht hnb hnc hne hnh hnn hns hnt hr- hrb hrc hre hrh hrn hrr hrs hrt hsb hsc hse hsh hsn hsr hss hst htb htc hte hth htn htr hts htt nbb nbc nbe nbn nbr nbs nbt ncb ncc nce nch ncn ncr ncs nct ne- neb nec nee neh nen ner nes net nhb nhc nhe nhh nhn nhr nhs nht nnb nnc nne nnh nnn nns nnt nrb nrc nre nrn nrr nrs nrt nsb nsc nse nsh nsn nsr nss nst ntb ntc nte nth ntn ntr nts ntt rbb rbc rbe rbh rbn rbr rbs rbt rcb rcc rce rch rcn rcr rcs rct re- reb rec ree reh ren rer res ret rh- rhb rhc rhe rhh rhn rhr rhs rht rnb rnc rnh rnn rnr rns rnt rrb rrc rrh rrn rrr rrs rrt rsb rsc rse rsh rsn rsr rss rst rtb rtc rte rtn rtr rts rtt sbb sbc sbe sbh sbn sbr sbs sbt scb scc sce sch scn scr scs sct se- seb sec see seh sen ser ses set sh- shb shc she shh shn shr shs sht snb snc sne snn snr sns snt sr- srb src sre srh srn srr srs srt ss- ssb ssc sse ssh ssn ssr sss sst stb stc ste sth stn str sts stt tbb tbc tbe tbh tbn tbr tbs tbt tcb tcc tce tch tcn tcr tcs tct te- teb tec tee teh ten ter tes tet th- thb thc the thh thn thr ths tht tnb tnc tne tnh tnn tnr tns tnt trb trc tre trh trn trr trs trt tsb tsc tse tsh tsn tsr tss tst ttb ttc tte tth ttn ttr tts ttt