-ic bbb bbc bbe bbi bbk bbo bbs bbt bbx bcb bcc bce bci bck bco bcs bct bcx be- beb bec bee bei bek beo bes bet bex bi- bib bic bie bii bik bio bis bit bix bkb bkc bke bkk bko bks bkt bkx bob boc boe boi bok boo bos bot box bsb bsc bse bsi bsk bso bss bst bsx btb btc bte bti btk bto bts btt btx bxb bxi bxo bxx c-- cbb cbc cbe cbi cbk cbo cbs cbt cbx ccb ccc cce cci cck cco ccs cct ccx ce- ceb cec cee cei cek ceo ces cet cex ci- cib cic cie cii cik cio cis cit cix ckb ckc cki cko cks ckt ckx co- cob coc coe coi cok coo cos cot cox csb csc cse csi csk cso css cst csx ctb ctc cte cti ctk cto cts ctt ctx cxc cxi cxk cxo cxs cxt cxx ebb ebc ebe ebi ebk ebo ebs ebt ebx ec- ecb ecc ece eci eck eco ecs ect ecx eeb eec eee eek eeo ees eet eex eib eic eie eii eik eio eis eit eix ekb ekc eke eki eko eks ekt eo- eob eoc eoe eoi eok eoo eos eot es- esb esc ese esi esk eso ess est esx etb etc ete eti etk eto ets ett etx ex- exc exe exi exo exs ext exx ibb ibc ibe ibi ibk ibo ibs ibt ibx icb icc ice ici ick ico ics ict ie- iec iee iei iek ies iet iex iib iic iie iii iio iis iit iix ikb ikc ike iki ikk iko iks ikt ikx io- iob ioc ioe ioi ioo ios iot is- isb isc ise isi isk iso iss ist itb itc ite iti itk ito its itt itx ixc ixe ixi k-t kbb kbc kbe kbi kbk kbo kbs kbx kcb kcc kce kci kck kcs kct kcx ke- keb kec kee kei kek keo kes ket kex kib kic kie kii kik kio kis kit kix kkb kkc kke kki kkk kks kkt kob koc koe koi kok koo kos kot ksb ksc kse ksi ksk kso kss kst ktb ktc kte ktk kto kts ktt kxo o-i ob- obb obc obe obi obk obo obs obt obx oc- ocb occ oci ock oco ocs oct ocx oeb oec oee oei oeo oes oet oex oib oic oie oii oik oio ois oit okb okc oke oki okk oko oks oo- oob ooc ooi ook ooo oos oot oox os- osb osc ose osi osk oso oss ost osx ot- otb otc ote oti otk oto ots ott ox- oxb oxc oxi oxo oxt oxx sbb sbc sbe sbi sbk sbo sbs sbt sbx scb scc sce sci sck sco scs sct scx se- seb sec see sei sek seo ses set sex sib sic sie sii sik sio sis sit six sk- skb skc ske ski skk sko sks skt skx sob soc soe soi sok soo sos sot sox ss- ssb ssc sse ssi ssk sso sss sst ssx stb stc ste sti stk sto sts stt stx sxc sxi sxs sxt t-x tbb tbc tbe tbi tbk tbo tbs tbt tcb tcc tce tci tck tco tcs tct tcx te- teb tec tee tei tek teo tes tet tex tib tic tie tii tik tio tis tit tix tkb tkc tke tkk tko tks tkt to- tob toc toe toi tok too tos tot tox tsb tsc tse tsi tsk tso tss tst tsx ttb ttc tte tti ttk tto tts ttt ttx txe txi txk txs txt xbc xbe xbx xcb xci xcx xee xes xet xex xic xie xii xio xis xit xix xkb xke xks xoc xoi xok xoo xos xot xox xsb xsc xsi xss xst xtc xti xts xtx xxi xxo xxx