-ic bbb bbc bbe bbi bbn bbo bbs bcb bcc bce bci bcn bco bcs be- beb bec bee bei ben beo bes bi- bib bic bie bii bin bio bis bnb bnc bne bni bnn bno bns bob boc boe boi bon boo bos bsb bsc bse bsi bsn bso bss c-- cbb cbc cbe cbi cbn cbo cbs ccb ccc cce cci ccn cco ccs ce- ceb cec cee cei cen ceo ces ci- cib cic cie cii cin cio cis cn- cnb cnc cne cni cnn cno cns co- cob coc coe coi con coo cos csb csc cse csi csn cso css ebb ebc ebe ebi ebn ebo ebs ec- ecb ecc ece eci ecn eco ecs eeb eec eee een eeo ees eib eic eie eii ein eio eis en- enb enc ene eni enn eno ens eo- eob eoc eoe eoi eon eoo eos es- esb esc ese esi esn eso ess ibb ibc ibe ibi ibn ibo ibs icb icc ice ici icn ico ics ie- iec iee iei ien ies iib iic iie iii iin iio iis in- inb inc ine ini inn ino ins io- iob ioc ioe ioi ion ioo ios is- isb isc ise isi isn iso iss n-i nbb nbc nbe nbi nbn nbo nbs ncb ncc nce nci ncn nco ncs ne- neb nec nee nei nen neo nes nib nic nie nii nin nio nis nnb nnc nne nni nnn nno nns no- nob noc noe noi non noo nos nsb nsc nse nsi nsn nso nss o-i ob- obb obc obe obi obn obo obs oc- ocb occ oci ocn oco ocs oeb oec oee oei oen oeo oes oib oic oie oii oin oio ois on- onb onc one oni onn ono ons oo- oob ooc ooi oon ooo oos os- osb osc ose osi osn oso oss sbb sbc sbe sbi sbn sbo sbs scb scc sce sci scn sco scs se- seb sec see sei sen seo ses sib sic sie sii sin sio sis snb snc sne sni snn sno sns sob soc soe soi son soo sos ss- ssb ssc sse ssi ssn sso sss