bbb bbc bbd bbn bbo bbr bbs bbt bcb bcc bcd bcn bco bcr bcs bct bdb bdc bdd bdo bdr bds bdt bnb bnc bnd bnn bno bnr bns bnt bob boc bod bon boo bor bos bot brb brd brn bro brr brs brt bsb bsc bsd bsn bso bsr bss bst btb btc btd btn bto btr bts btt c-- cbb cbc cbd cbn cbo cbr cbs cbt ccb ccc ccd ccn cco ccr ccs cct cdb cdc cdd cdn cdo cdr cds cdt cn- cnb cnc cnd cnn cno cnr cns cnt co- cob coc cod con coo cor cos cot crb crc crd crn cro crr crs crt csb csc csd csn cso csr css cst ctb ctc ctd ctn cto ctr cts ctt dbb dbc dbd dbn dbo dbr dbs dbt dcb dcc dcd dcn dco dcr dcs dct ddb ddc ddd ddn ddo ddr dds ddt dnb dnc dnd dnn dno dnr dns dnt dob doc dod don doo dor dos dot drb drc drd drn dro drr drs drt dsb dsc dsd dsn dso dsr dss dst dtb dtc dtd dtn dto dtr dts dtt nbb nbc nbd nbn nbo nbr nbs nbt ncb ncc ncd ncn nco ncr ncs nct ndb ndc ndd ndn ndo ndr nds ndt nnb nnc nnn nno nns nnt no- nob noc nod non noo nor nos not nrb nrc nrd nrn nro nrr nrs nrt nsb nsc nsd nsn nso nsr nss nst ntb ntc ntd ntn nto ntr nts ntt ob- obb obc obd obn obo obr obs obt oc- ocb occ ocd ocn oco ocr ocs oct odb odc odd odn odo odr ods odt on- onb onc ond onn ono onr ons ont oo- oob ooc ood oon ooo oor oos oot or- orb orc ord orn oro orr ors ort os- osb osc osd osn oso osr oss ost ot- otb otc otd otn oto otr ots ott rbb rbc rbd rbn rbo rbr rbs rbt rcb rcc rcd rcn rco rcr rcs rct rdb rdc rdd rdn rdo rdr rds rdt rnb rnc rnd rnn rno rnr rns rnt rob roc rod ron roo ror ros rot rrb rrc rrd rrn rrr rrs rrt rsb rsc rsd rsn rso rsr rss rst rtb rtc rtd rtn rto rtr rts rtt sbb sbc sbd sbn sbo sbr sbs sbt scb scc scd scn sco scr scs sct sdb sdc sdd sdn sdo sdr sds sdt snb snc snd snn sno snr sns snt sob soc sod son soo sor sos sot sr- srb src srd srn sro srr srs srt ss- ssb ssc ssd ssn sso ssr sss sst stb stc std stn sto str sts stt tbb tbc tbd tbn tbo tbr tbs tbt tcb tcc tcd tcn tco tcr tcs tct tdb tdc tdd tdn tdo tdr tds tdt tnb tnc tnd tnn tno tnr tns tnt to- tob toc tod ton too tor tos tot trb trc trd trn tro trr trs trt tsb tsc tsd tsn tso tsr tss tst ttb ttc ttd ttn tto ttr tts ttt