-er -th bbb bbc bbd bbe bbh bbk bbo bbr bbt bcb bcc bcd bce bch bck bco bcr bct bdb bdc bdd bde bdh bdk bdo bdr bdt be- beb bec bed bee beh bek beo ber bet bhb bhc bhd bhe bhh bhk bho bhr bht bkb bkc bke bkk bko bkr bkt bob boc bod boe boh bok boo bor bot brb brd bre brh brk bro brr brt btb btc btd bte bth btk bto btr btt c-- cbb cbc cbd cbe cbh cbk cbo cbr cbt ccb ccc ccd cce cch cck cco ccr cct cdb cdc cdd cde cdh cdk cdo cdr cdt ce- ceb cec ced cee ceh cek ceo cer cet ch- chb chc chd che chh chk cho chr cht ckb ckc ckd ckh cko ckt co- cob coc cod coe coh cok coo cor cot crb crc crd cre crh crk cro crr crt ctb ctc ctd cte cth ctk cto ctr ctt dbb dbc dbd dbe dbh dbk dbo dbr dbt dcb dcc dcd dce dck dco dcr dct ddb ddc ddd dde ddh ddk ddo ddr ddt de- deb dec ded dee deh dek deo der det dh- dhb dhc dhd dhe dhh dhk dho dhr dht dkb dkc dke dkk dko dkr dkt dob doc dod doe doh dok doo dor dot drb drc drd dre drk dro drr drt dtb dtc dtd dte dth dtk dto dtr dtt ebb ebc ebd ebe ebh ebk ebo ebr ebt ec- ecb ecc ecd ece ech eck eco ecr ect ed- edb edc edd ede edh edk edo edr edt eeb eec eed eee eek eeo eer eet ehb ehc ehd ehe ehh eho ehr eht ekb ekc ekd eke ekh eko ekr ekt eo- eob eoc eod eoe eoh eok eoo eor eot erb erc erd ere erh erk ero err ert etb etc etd ete eth etk eto etr ett hbb hbc hbd hbe hbh hbk hbo hbr hbt hcb hcc hcd hce hch hck hco hcr hct hdb hdc hdd hde hdh hdk hdo hdr hdt he- heb hec hed hee heh hek heo her het hhb hhc hhd hhe hhh hhk hho hhr hht hkb hkd hkh hkk hko hkr hkt hob hoc hod hoe hoh hok hoo hor hot hr- hrb hrc hrd hre hrh hrk hro hrr hrt htb htc htd hte hth htk hto htr htt k-t kbb kbc kbd kbe kbh kbk kbo kbr kcb kcc kcd kce kch kck kcr kct kdb kdc kde kdh kdk kdo kdr kdt ke- keb kec ked kee keh kek keo ker ket khe khh khk kho khr kkb kkc kke kkh kkk kkr kkt kob koc kod koe koh kok koo kor kot krc krd krk kro krr krt ktb ktc kte kth ktk kto ktr ktt ob- obb obc obd obe obh obk obo obr obt oc- ocb occ ocd och ock 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 okb okc okd oke okk oko okr oo- oob ooc ood ooh ook ooo oor oot or- orb orc ord ore orh ork oro orr ort ot- otb otc otd ote oth otk oto otr ott rbb rbc rbd rbe rbh rbk 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 rek reo rer ret rh- rhb rhc rhd rhe rhh rho rhr rht rkb rkc rke rkk rko rkt rob roc rod roe roh rok roo ror rot rrb rrc rrd rrh rrk rrr rrt rtb rtc rtd rte rtk rto rtr rtt tbb tbc tbd tbe tbh tbk tbo tbr tbt tcb tcc tcd tce tch tck tco tcr tct tdb tdc tdd tde tdh tdk tdo tdr tdt te- teb tec ted tee teh tek teo ter tet th- thb thc thd the thh thk tho thr tht tkb tkc tke tkk tko tkr tkt to- tob toc tod toe toh tok too tor tot trb trc trd tre trh trk tro trr trt ttb ttc ttd tte tth ttk tto ttr ttt