-er -th bbb bbc bbe bbh bbk bbn bbo bbr bbt bcb bcc bce bch bck bcn bco bcr bct be- beb bec bee beh bek ben beo ber bet bhb bhc bhe bhh bhk bho bhr bht bkb bkc bke bkk bkn bko bkr bkt bnb bnc bne bnk bnn bno bnr bnt bob boc boe boh bok bon boo bor bot brb bre brh brk brn bro brr brt btb btc bte bth btk btn bto btr btt c-- cbb cbc cbe cbh cbk cbn cbo cbr cbt ccb ccc cce cch cck ccn cco ccr cct ce- ceb cec cee ceh cek cen ceo cer cet ch- chb chc che chh chk chn cho chr cht ckb ckc ckh cko ckt cn- cnb cnc cne cnh cnn cno cnr cnt co- cob coc coe coh cok con coo cor cot crb crc cre crh crk crn cro crr crt ctb ctc cte cth ctk ctn cto ctr ctt ebb ebc ebe ebh ebk ebn ebo ebr ebt ec- ecb ecc ece ech eck ecn eco ecr ect eeb eec eee eek een eeo eer eet ehb ehc ehe ehh ehn eho ehr eht ekb ekc eke ekh eko ekr ekt en- enb enc ene enh enk enn eno enr ent eo- eob eoc eoe eoh eok eon eoo eor eot erb erc ere erh erk ern ero err ert etb etc ete eth etk etn eto etr ett hbb hbc hbe hbh hbk hbn hbo hbr hbt hcb hcc hce hch hck hcn hco hcr hct he- heb hec hee heh hek hen heo her het hhb hhc hhe hhh hhk hhn hho hhr hht hkb hkh hkk hkn hko hkr hkt hnb hnc hne hnh hnk hnn hno hnt hob hoc hoe hoh hok hon hoo hor hot hr- hrb hrc hre hrh hrk hrn hro hrr hrt htb htc hte hth htk htn hto htr htt k-t kbb kbc kbe kbh kbk kbn kbo kbr kcb kcc kce kch kck kcn kcr kct ke- keb kec kee keh kek ken keo ker ket khe khh khk khn kho khr kkb kkc kke kkh kkk kkn kkr kkt kn- knc kne knk knn kno knr knt kob koc koe koh kok kon koo kor kot krc krk krn kro krr krt ktb ktc kte kth ktk ktn kto ktr ktt nbb nbc nbe nbk nbn nbo nbr nbt ncb ncc nce nch nck ncn nco ncr nct ne- neb nec nee neh nek nen neo ner net nhb nhc nhe nhh nhk nhn nhr nht nkc nke nkk nkn nko nkr nkt nnb nnc nne nnh nnk nnn nno nnt no- nob noc noe noh nok non noo nor not nrb nrc nre nrk nrn nro nrr nrt ntb ntc nte nth ntk ntn nto ntr ntt ob- obb obc obe obh obk obn obo obr obt oc- ocb occ och ock ocn oco ocr oct oeb oec oee oeh oen oeo oer oet ohc ohe ohh ohn oho ohr oht okb okc oke okk oko okr on- onb onc one onh onk onn ono onr ont oo- oob ooc ooh ook oon ooo oor oot or- orb orc ore orh ork orn oro orr ort ot- otb otc ote oth otk otn oto otr ott rbb rbc rbe rbh rbk rbn rbo rbr rbt rcb rcc rce rch rcn rco rcr rct re- reb rec ree reh rek ren reo rer ret rh- rhb rhc rhe rhh rhn rho rhr rht rkb rkc rke rkk rko rkt rnb rnc rnh rnn rno rnr rnt rob roc roe roh rok ron roo ror rot rrb rrc rrh rrk rrn rrr rrt rtb rtc rte rtk rtn rto rtr rtt tbb tbc tbe tbh tbk tbn tbo tbr tbt tcb tcc tce tch tck tcn tco tcr tct te- teb tec tee teh tek ten teo ter tet th- thb thc the thh thk thn tho thr tht tkb tkc tke tkk tko tkr tkt tnb tnc tne tnh tnk tnn tno tnr tnt to- tob toc toe toh tok ton too tor tot trb trc tre trh trk trn tro trr trt ttb ttc tte tth ttk ttn tto ttr ttt