-ic bbb bbc bbd bbi bbs bby bcb bcc bcd bci bcs bcy bdb bdc bdd bdi bds bdy bi- bib bic bid bii bis biy bsb bsc bsd bsi bss bsy by- byc byd byi bys c-- cbb cbc cbd cbi cbs cby ccb ccc ccd cci ccs cdb cdc cdd cdi cds cdy ci- cib cic cid cii cis csb csc csd csi css csy cyb cyc cyd cys dbb dbc dbd dbi dbs dby dcb dcc dcd dci dcs ddb ddc ddd ddi dds ddy di- dib dic did dii dis diy dsb dsc dsd dsi dss dsy dy- dyb dyc dyd dys dyy i-d ibb ibc ibd ibi ibs iby icb icc icd ici ics icy idb idc idd idi ids idy iib iic iid iii iis is- isb isc isd isi iss isy iyc iys iyy sbb sbc sbd sbi sbs sby scb scc scd sci scs sdb sdc sdd sdi sds sdy sib sic sid sii sis ss- ssb ssc ssd ssi sss sy- syb syc syd syi sys ybc ybi ybs yby ycc ycd yci ycs ycy yds ydy yid yii yis ysb ysc ysi yss ysy yyb yyc yys yyy