-ic bbb bbc bbe bbi bbn bbs bbt bcb bcc bce bci bcn bcs bct be- beb bec bee bei ben bes bet bi- bib bic bie bii bin bis bit bnb bnc bne bni bnn bns bnt bsb bsc bse bsi bsn bss bst btb btc bte bti btn bts btt c-- cbb cbc cbe cbi cbn cbs cbt ccb ccc cce cci ccn ccs cct ce- ceb cec cee cei cen ces cet ci- cib cic cie cii cin cis cit cn- cnb cnc cne cni cnn cns cnt csb csc cse csi csn css cst ctb ctc cte cti ctn cts ctt ebb ebc ebe ebi ebn ebs ebt ec- ecb ecc ece eci ecn ecs ect eeb eec eee een ees eet eib eic eie eii ein eis eit en- enb enc ene eni enn ens ent es- esb esc ese esi esn ess est etb etc ete eti etn ets ett ibb ibc ibe ibi ibn ibs ibt icb icc ice ici icn ics ict ie- iec iee iei ien ies iet iib iic iie iii iin iis iit in- inb inc ine ini inn ins int is- isb isc ise isi isn iss ist itb itc ite iti itn its itt n-i nbb nbc nbe nbi nbn nbs nbt ncb ncc nce nci ncn ncs nct ne- neb nec nee nei nen nes net nib nic nie nii nin nis nit nnb nnc nne nni nnn nns nnt nsb nsc nse nsi nsn nss nst ntb ntc nte nti ntn nts ntt sbb sbc sbe sbi sbn sbs sbt scb scc sce sci scn scs sct se- seb sec see sei sen ses set sib sic sie sii sin sis sit snb snc sne sni snn sns snt ss- ssb ssc sse ssi ssn sss sst stb stc ste sti stn sts stt tbb tbc tbe tbi tbn tbs tbt tcb tcc tce tci tcn tcs tct te- teb tec tee tei ten tes tet tib tic tie tii tin tis tit tnb tnc tne tni tnn tns tnt tsb tsc tse tsi tsn tss tst ttb ttc tte tti ttn tts ttt