-ic bbb bbc bbe bbi bbk bbn bbo bbs bbt bcb bcc bce bci bck bcn bco bcs bct be- beb bec bee bei bek ben beo bes bet bi- bib bic bie bii bik bin bio bis bit bkb bkc bke bkk bkn bko bks bkt bnb bnc bne bni bnk bnn bno bns bnt bob boc boe boi bok bon boo bos bot bsb bsc bse bsi bsk bsn bso bss bst btb btc bte bti btk btn bto bts btt c-- cbb cbc cbe cbi cbk cbn cbo cbs cbt ccb ccc cce cci cck ccn cco ccs cct ce- ceb cec cee cei cek cen ceo ces cet ci- cib cic cie cii cik cin cio cis cit ckb ckc cki cko cks ckt cn- cnb cnc cne cni cnn cno cns cnt co- cob coc coe coi cok con coo cos cot csb csc cse csi csk csn cso css cst ctb ctc cte cti ctk ctn cto cts ctt ebb ebc ebe ebi ebk ebn ebo ebs ebt ec- ecb ecc ece eci eck ecn eco ecs ect eeb eec eee eek een eeo ees eet eib eic eie eii eik ein eio eis eit ekb ekc eke eki eko eks ekt en- enb enc ene eni enk enn eno ens ent eo- eob eoc eoe eoi eok eon eoo eos eot es- esb esc ese esi esk esn eso ess est etb etc ete eti etk etn eto ets ett ibb ibc ibe ibi ibk ibn ibo ibs ibt icb icc ice ici ick icn ico ics ict ie- iec iee iei iek ien ies iet iib iic iie iii iin iio iis iit ikb ikc ike iki ikk iko iks ikt in- inb inc ine ini ink inn ino ins int io- iob ioc ioe ioi ion ioo ios iot is- isb isc ise isi isk isn iso iss ist itb itc ite iti itk itn ito its itt k-t kbb kbc kbe kbi kbk kbn kbo kbs kcb kcc kce kci kck kcn kcs kct ke- keb kec kee kei kek ken keo kes ket kib kic kie kii kik kin kio kis kit kkb kkc kke kki kkk kkn kks kkt kn- knc kne kni knk knn kno knt kob koc koe koi kok kon koo kos kot ksb ksc kse ksi ksk ksn kso kss kst ktb ktc kte ktk ktn kto kts ktt n-i nbb nbc nbe nbi nbk nbn nbo nbs nbt ncb ncc nce nci nck ncn nco ncs nct ne- neb nec nee nei nek nen neo nes net nib nic nie nii nik nin nio nis nit nkc nke nki nkk nkn nko nks nkt nnb nnc nne nni nnk nnn nno nns nnt no- nob noc noe noi nok non noo nos not nsb nsc nse nsi nsk nsn nso nss nst ntb ntc nte nti ntk ntn nto nts ntt o-i ob- obb obc obe obi obk obn obo obs obt oc- ocb occ oci ock ocn oco ocs oct oeb oec oee oei oen oeo oes oet oib oic oie oii oik oin oio ois oit okb okc oke oki okk oko oks on- onb onc one oni onk onn ono ons ont oo- oob ooc ooi ook oon ooo oos oot os- osb osc ose osi osk osn oso oss ost ot- otb otc ote oti otk otn oto ots ott sbb sbc sbe sbi sbk sbn sbo sbs sbt scb scc sce sci sck scn sco scs sct se- seb sec see sei sek sen seo ses set sib sic sie sii sik sin sio sis sit sk- skb skc ske ski skk sko sks skt snb snc sne sni snk snn sno sns snt sob soc soe soi sok son soo sos sot ss- ssb ssc sse ssi ssk ssn sso sss sst stb stc ste sti stk stn sto sts stt tbb tbc tbe tbi tbk tbn tbo tbs tbt tcb tcc tce tci tck tcn tco tcs tct te- teb tec tee tei tek ten teo tes tet tib tic tie tii tik tin tio tis tit tkb tkc tke tkk tko tks tkt tnb tnc tne tni tnk tnn tno tns tnt to- tob toc toe toi tok ton too tos tot tsb tsc tse tsi tsk tsn tso tss tst ttb ttc tte tti ttk ttn tto tts ttt