-ic bbb bbc bbe bbi bbo bbs bcb bcc bce bci bco bcs be- beb bec bee bei beo bes bi- bib bic bie bii bio bis bob boc boe boi boo bos bsb bsc bse bsi bso bss c-- cbb cbc cbe cbi cbo cbs ccb ccc cce cci cco ccs ce- ceb cec cee cei ceo ces ci- cib cic cie cii cio cis co- cob coc coe coi coo cos csb csc cse csi cso css ebb ebc ebe ebi ebo ebs ec- ecb ecc ece eci eco ecs eeb eec eee eeo ees eib eic eie eii eio eis eo- eob eoc eoe eoi eoo eos es- esb esc ese esi eso ess ibb ibc ibe ibi ibo ibs icb icc ice ici ico ics ie- iec iee iei ies iib iic iie iii iio iis io- iob ioc ioe ioi ioo ios is- isb isc ise isi iso iss o-i ob- obb obc obe obi obo obs oc- ocb occ oci oco ocs oeb oec oee oei oeo oes oib oic oie oii oio ois oo- oob ooc ooi ooo oos os- osb osc ose osi oso oss sbb sbc sbe sbi sbo sbs scb scc sce sci sco scs se- seb sec see sei seo ses sib sic sie sii sio sis sob soc soe soi soo sos ss- ssb ssc sse ssi sso sss