-ic bbb bbc bbe bbi bbn bbs bcb bcc bce bci bcn bcs be- beb bec bee bei ben bes bi- bib bic bie bii bin bis bnb bnc bne bni bnn bns bsb bsc bse bsi bsn bss c-- cbb cbc cbe cbi cbn cbs ccb ccc cce cci ccn ccs ce- ceb cec cee cei cen ces ci- cib cic cie cii cin cis cn- cnb cnc cne cni cnn cns csb csc cse csi csn css ebb ebc ebe ebi ebn ebs ec- ecb ecc ece eci ecn ecs eeb eec eee een ees eib eic eie eii ein eis en- enb enc ene eni enn ens es- esb esc ese esi esn ess ibb ibc ibe ibi ibn ibs icb icc ice ici icn ics ie- iec iee iei ien ies iib iic iie iii iin iis in- inb inc ine ini inn ins is- isb isc ise isi isn iss n-i nbb nbc nbe nbi nbn nbs ncb ncc nce nci ncn ncs ne- neb nec nee nei nen nes nib nic nie nii nin nis nnb nnc nne nni nnn nns nsb nsc nse nsi nsn nss sbb sbc sbe sbi sbn sbs scb scc sce sci scn scs se- seb sec see sei sen ses sib sic sie sii sin sis snb snc sne sni snn sns ss- ssb ssc sse ssi ssn sss