-er -th bbb bbc bbd bbe bbh bbo bbr bbt bcb bcc bcd bce bch bco bcr bct bdb bdc bdd bde bdh bdo bdr bdt be- beb bec bed bee beh beo ber bet bhb bhc bhd bhe bhh bho bhr bht bob boc bod boe boh boo bor bot brb brd bre brh bro brr brt btb btc btd bte bth bto btr btt c-- cbb cbc cbd cbe cbh cbo cbr cbt ccb ccc ccd cce cch cco ccr cct cdb cdc cdd cde cdh cdo cdr cdt ce- ceb cec ced cee ceh ceo cer cet ch- chb chc chd che chh cho chr cht co- cob coc cod coe coh coo cor cot crb crc crd cre crh cro crr crt ctb ctc ctd cte cth cto ctr ctt dbb dbc dbd dbe dbh dbo dbr dbt dcb dcc dcd dce dco dcr dct ddb ddc ddd dde ddh ddo ddr ddt de- deb dec ded dee deh deo der det dh- dhb dhc dhd dhe dhh dho dhr dht dob doc dod doe doh doo dor dot drb drc drd dre dro drr drt dtb dtc dtd dte dth dto dtr dtt ebb ebc ebd ebe ebh ebo ebr ebt ec- ecb ecc ecd ece ech eco ecr ect ed- edb edc edd ede edh edo edr edt eeb eec eed eee eeo eer eet ehb ehc ehd ehe ehh eho ehr eht eo- eob eoc eod eoe eoh eoo eor eot erb erc erd ere erh ero err ert etb etc etd ete eth eto etr ett hbb hbc hbd hbe hbh hbo hbr hbt hcb hcc hcd hce hch hco hcr hct hdb hdc hdd hde hdh hdo hdr hdt he- heb hec hed hee heh heo her het hhb hhc hhd hhe hhh hho hhr hht hob hoc hod hoe hoh hoo hor hot hr- hrb hrc hrd hre hrh hro hrr hrt htb htc htd hte hth hto htr htt ob- obb obc obd obe obh obo obr obt oc- ocb occ ocd och oco ocr oct odb odc odd ode odh odo odr odt oeb oec oed oee oeh oeo oer oet ohc ohd ohe ohh oho ohr oht oo- oob ooc ood ooh ooo oor oot or- orb orc ord ore orh oro orr ort ot- otb otc otd ote oth oto otr ott rbb rbc rbd rbe rbh rbo rbr rbt rcb rcc rcd rce rch rco rcr rct rdb rdc rdd rde rdh rdo rdr rdt re- reb rec red ree reh reo rer ret rh- rhb rhc rhd rhe rhh rho rhr rht rob roc rod roe roh roo ror rot rrb rrc rrd rrh rrr rrt rtb rtc rtd rte rto rtr rtt tbb tbc tbd tbe tbh tbo tbr tbt tcb tcc tcd tce tch tco tcr tct tdb tdc tdd tde tdh tdo tdr tdt te- teb tec ted tee teh teo ter tet th- thb thc thd the thh tho thr tht to- tob toc tod toe toh too tor tot trb trc trd tre trh tro trr trt ttb ttc ttd tte tth tto ttr ttt