-ic bbb bbc bbd bbe bbi bbk bbo bbx bcb bcc bcd bce bci bck bco bcx bdb bdc bdd bde bdi bdk bdo bdx be- beb bec bed bee bei bek beo bex bi- bib bic bid bie bii bik bio bix bkb bkc bke bkk bko bkx bob boc bod boe boi bok boo box bxb bxd bxi bxo bxx c-- cbb cbc cbd cbe cbi cbk cbo cbx ccb ccc ccd cce cci cck cco ccx cdb cdc cdd cde cdi cdk cdo cdx ce- ceb cec ced cee cei cek ceo cex ci- cib cic cid cie cii cik cio cix ckb ckc ckd cki cko ckx co- cob coc cod coe coi cok coo cox cxc cxi cxk cxo cxx dbb dbc dbd dbe dbi dbk dbo dbx dcb dcc dcd dce dci dck dco dcx ddb ddc ddd dde ddi ddk ddo ddx de- deb dec ded dee dei dek deo dex di- dib dic did die dii dik dio dix dkb dkc dke dki dkk dko dkx dob doc dod doe doi dok doo dox dxc dxd dxi dxo dxx ebb ebc ebd ebe ebi ebk ebo ebx ec- ecb ecc ecd ece eci eck eco ecx ed- edb edc edd ede edi edk edo edx eeb eec eed eee eek eeo eex eib eic eid eie eii eik eio eix ekb ekc ekd eke eki eko eo- eob eoc eod eoe eoi eok eoo ex- exc exd exe exi exo exx i-d ibb ibc ibd ibe ibi ibk ibo ibx icb icc icd ice ici ick ico idb idc idd ide idi idk ido idx ie- iec ied iee iei iek iex iib iic iid iie iii iio iix ikb ikc ike iki ikk iko ikx io- iob ioc iod ioe ioi ioo ixc ixe ixi kbb kbc kbd kbe kbi kbk kbo kbx kcb kcc kcd kce kci kck kcx kdb kdc kde kdk kdo kdx ke- keb kec ked kee kei kek keo kex kib kic kid kie kii kik kio kix kkb kkc kke kki kkk kob koc kod koe koi kok koo kxo o-i ob- obb obc obd obe obi obk obo obx oc- ocb occ ocd oci ock oco ocx odb odc odd ode odi odo oeb oec oed oee oei oeo oex oib oic oid oie oii oik oio okb okc okd oke oki okk oko oo- oob ooc ood ooi ook ooo oox ox- oxb oxc oxi oxo oxx xbc xbe xbx xcb xcd xci xcx xdb xdc xde xdi xdk xed xee xex xic xie xii xio xix xkb xke xoc xod xoi xok xoo xox xxi xxo xxx