-ic bbb bbc bbd bbi bby bcb bcc bcd bci bcy bdb bdc bdd bdi bdy bi- bib bic bid bii biy by- byc byd byi c-- cbb cbc cbd cbi cby ccb ccc ccd cci cdb cdc cdd cdi cdy ci- cib cic cid cii cyb cyc cyd dbb dbc dbd dbi dby dcb dcc dcd dci ddb ddc ddd ddi ddy di- dib dic did dii diy dy- dyb dyc dyd dyy i-d ibb ibc ibd ibi iby icb icc icd ici icy idb idc idd idi idy iib iic iid iii iyc iyy ybc ybi yby ycc ycd yci ycy ydy yid yii yyb yyc yyy