-ey c-- ccc ccd cce cck cco cdc cdd cde cdk cdo cdy ce- cec ced cee cek ceo cey ckc ckd cko cky co- coc cod coe cok coo coy cyc cyd cye cyk cyo dcc dcd dce dck dco ddc ddd dde ddk ddo ddy de- dec ded dee dek deo dey dkc dke dkk dko doc dod doe dok doo doy dy- dyc dyd dye dyk dyo dyy ec- ecc ecd ece eck eco ed- edc edd ede edk edo edy eec eed eee eek eeo eey ekc ekd eke eko eky eo- eoc eod eoe eok eoo eyc eyd eye eyo kcc kcd kce kck kdc kde kdk kdo kdy ke- kec ked kee kek keo key kkc kke kkk kky koc kod koe kok koo koy kyc kyd kye kyo oc- occ ocd ock oco odc odd ode odo oec oed oee oeo oey okc okd oke okk oko oo- ooc ood ook ooo oyd oye oyo ycc ycd yce yco ycy yde ydo ydy yec yed yee yek yeo yey ykk yoc yod yoe yok yoo yoy yyc yye yyy