-ic bbb bbc bbe bbi bbn bbo bbs bbt bcb bcc bce bci bcn bco bcs bct be- beb bec bee bei ben beo bes bet bi- bib bic bie bii bin bio bis bit bnb bnc bne bni bnn bno bns bnt bob boc boe boi bon boo bos bot bsb bsc bse bsi bsn bso bss bst btb btc bte bti btn bto bts btt c-- cbb cbc cbe cbi cbn cbo cbs cbt ccb ccc cce cci ccn cco ccs cct ce- ceb cec cee cei cen ceo ces cet ci- cib cic cie cii cin cio cis cit cn- cnb cnc cne cni cnn cno cns cnt co- cob coc coe coi con coo cos cot csb csc cse csi csn cso css cst ctb ctc cte cti ctn cto cts ctt ebb ebc ebe ebi ebn ebo ebs ebt ec- ecb ecc ece eci ecn eco ecs ect eeb eec eee een eeo ees eet eib eic eie eii ein eio eis eit en- enb enc ene eni enn eno ens ent eo- eob eoc eoe eoi eon eoo eos eot es- esb esc ese esi esn eso ess est etb etc ete eti etn eto ets ett ibb ibc ibe ibi ibn ibo ibs ibt icb icc ice ici icn ico ics ict ie- iec iee iei ien ies iet iib iic iie iii iin iio iis iit in- inb inc ine ini inn ino ins int io- iob ioc ioe ioi ion ioo ios iot is- isb isc ise isi isn iso iss ist itb itc ite iti itn ito its itt n-i nbb nbc nbe nbi nbn nbo nbs nbt ncb ncc nce nci ncn nco ncs nct ne- neb nec nee nei nen neo nes net nib nic nie nii nin nio nis nit nnb nnc nne nni nnn nno nns nnt no- nob noc noe noi non noo nos not nsb nsc nse nsi nsn nso nss nst ntb ntc nte nti ntn nto nts ntt o-i ob- obb obc obe obi obn obo obs obt oc- ocb occ oci ocn oco ocs oct oeb oec oee oei oen oeo oes oet oib oic oie oii oin oio ois oit on- onb onc one oni onn ono ons ont oo- oob ooc ooi oon ooo oos oot os- osb osc ose osi osn oso oss ost ot- otb otc ote oti otn oto ots ott sbb sbc sbe sbi sbn sbo sbs sbt scb scc sce sci scn sco scs sct se- seb sec see sei sen seo ses set sib sic sie sii sin sio sis sit snb snc sne sni snn sno sns snt sob soc soe soi son soo sos sot ss- ssb ssc sse ssi ssn sso sss sst stb stc ste sti stn sto sts stt tbb tbc tbe tbi tbn tbo tbs tbt tcb tcc tce tci tcn tco tcs tct te- teb tec tee tei ten teo tes tet tib tic tie tii tin tio tis tit tnb tnc tne tni tnn tno tns tnt to- tob toc toe toi ton too tos tot tsb tsc tse tsi tsn tso tss tst ttb ttc tte tti ttn tto tts ttt