-ic bbb bbc bbd bbe bbi bbo bbs bcb bcc bcd bce bci bco bcs bdb bdc bdd bde bdi bdo bds be- beb bec bed bee bei beo bes bi- bib bic bid bie bii bio bis bob boc bod boe boi boo bos bsb bsc bsd bse bsi bso bss c-- cbb cbc cbd cbe cbi cbo cbs ccb ccc ccd cce cci cco ccs cdb cdc cdd cde cdi cdo cds ce- ceb cec ced cee cei ceo ces ci- cib cic cid cie cii cio cis co- cob coc cod coe coi coo cos csb csc csd cse csi cso css dbb dbc dbd dbe dbi dbo dbs dcb dcc dcd dce dci dco dcs ddb ddc ddd dde ddi ddo dds de- deb dec ded dee dei deo des di- dib dic did die dii dio dis dob doc dod doe doi doo dos dsb dsc dsd dse dsi dso dss ebb ebc ebd ebe ebi ebo ebs ec- ecb ecc ecd ece eci eco ecs ed- edb edc edd ede edi edo eds eeb eec eed eee eeo ees eib eic eid eie eii eio eis eo- eob eoc eod eoe eoi eoo eos es- esb esc esd ese esi eso ess i-d ibb ibc ibd ibe ibi ibo ibs icb icc icd ice ici ico ics idb idc idd ide idi ido ids ie- iec ied iee iei ies iib iic iid iie iii iio iis io- iob ioc iod ioe ioi ioo ios is- isb isc isd ise isi iso iss o-i ob- obb obc obd obe obi obo obs oc- ocb occ ocd oci oco ocs odb odc odd ode odi odo ods oeb oec oed oee oei oeo oes oib oic oid oie oii oio ois oo- oob ooc ood ooi ooo oos os- osb osc osd ose osi oso oss sbb sbc sbd sbe sbi sbo sbs scb scc scd sce sci sco scs sdb sdc sdd sde sdi sdo sds se- seb sec sed see sei seo ses sib sic sid sie sii sio sis sob soc sod soe soi soo sos ss- ssb ssc ssd sse ssi sso sss