-er -th bbb bbd bbe bbh bbr bbs bbt bdb bdd bde bdh bdr bds bdt be- beb bed bee beh ber bes bet bhb bhd bhe bhh bhr bhs bht brb brd bre brh brr brs brt bsb bsd bse bsh bsr bss bst btb btd bte bth btr bts btt dbb dbd dbe dbh dbr dbs dbt ddb ddd dde ddh ddr dds ddt de- deb ded dee deh der des det dh- dhb dhd dhe dhh dhr dhs dht drb drd dre drr drs drt dsb dsd dse dsh dsr dss dst dtb dtd dte dth dtr dts dtt ebb ebd ebe ebh ebr ebs ebt ed- edb edd ede edh edr eds edt eeb eed eee eer ees eet ehb ehd ehe ehh ehr ehs eht erb erd ere erh err ers ert es- esb esd ese esh esr ess est etb etd ete eth etr ets ett hbb hbd hbe hbh hbr hbs hbt hdb hdd hde hdh hdr hds hdt he- heb hed hee heh her hes het hhb hhd hhe hhh hhr hhs hht hr- hrb hrd hre hrh hrr hrs hrt hsb hsd hse hsh hsr hss hst htb htd hte hth htr hts htt rbb rbd rbe rbh rbr rbs rbt rdb rdd rde rdh rdr rds rdt re- reb red ree reh rer res ret rh- rhb rhd rhe rhh rhr rhs rht rrb rrd rrh rrr rrs rrt rsb rsd rse rsh rsr rss rst rtb rtd rte rtr rts rtt sbb sbd sbe sbh sbr sbs sbt sdb sdd sde sdh sdr sds sdt se- seb sed see seh ser ses set sh- shb shd she shh shr shs sht sr- srb srd sre srh srr srs srt ss- ssb ssd sse ssh ssr sss sst stb std ste sth str sts stt tbb tbd tbe tbh tbr tbs tbt tdb tdd tde tdh tdr tds tdt te- teb ted tee teh ter tes tet th- thb thd the thh thr ths tht trb trd tre trh trr trs trt tsb tsd tse tsh tsr tss tst ttb ttd tte tth ttr tts ttt