-ic bbb bbc bbd bbi bbo bbs bbt bby bcb bcc bcd bci bco bcs bct bcy bdb bdc bdd bdi bdo bds bdt bdy bi- bib bic bid bii bio bis bit biy bob boc bod boi boo bos bot boy bsb bsc bsd bsi bso bss bst bsy btb btc btd bti bto bts btt bty by- byc byd byi byo bys byt c-- cbb cbc cbd cbi cbo cbs cbt cby ccb ccc ccd cci cco ccs cct cdb cdc cdd cdi cdo cds cdt cdy ci- cib cic cid cii cio cis cit co- cob coc cod coi coo cos cot coy csb csc csd csi cso css cst csy ctb ctc ctd cti cto cts ctt cty cyb cyc cyd cyo cys cyt dbb dbc dbd dbi dbo dbs dbt dby dcb dcc dcd dci dco dcs dct ddb ddc ddd ddi ddo dds ddt ddy di- dib dic did dii dio dis dit diy dob doc dod doi doo dos dot doy dsb dsc dsd dsi dso dss dst dsy dtb dtc dtd dti dto dts dtt dty dy- dyb dyc dyd dyo dys dyy i-d ibb ibc ibd ibi ibo ibs ibt iby icb icc icd ici ico ics ict icy idb idc idd idi ido ids idt idy iib iic iid iii iio iis iit io- iob ioc iod ioi ioo ios iot is- isb isc isd isi iso iss ist isy itb itc itd iti ito its itt ity iyc iyo iys iyt iyy o-i ob- obb obc obd obi obo obs obt oby oc- ocb occ ocd oci oco ocs oct odb odc odd odi odo ods odt oib oic oid oii oio ois oit oo- oob ooc ood ooi ooo oos oot os- osb osc osd osi oso oss ost ot- otb otc otd oti oto ots ott oyd oyi oyo oys sbb sbc sbd sbi sbo sbs sbt sby scb scc scd sci sco scs sct sdb sdc sdd sdi sdo sds sdt sdy sib sic sid sii sio sis sit sob soc sod soi soo sos sot soy ss- ssb ssc ssd ssi sso sss sst stb stc std sti sto sts stt sty sy- syb syc syd syi sys syt tbb tbc tbd tbi tbo tbs tbt tcb tcc tcd tci tco tcs tct tdb tdc tdd tdi tdo tds tdt tdy tib tic tid tii tio tis tit tiy to- tob toc tod toi too tos tot toy tsb tsc tsd tsi tso tss tst tsy ttb ttc ttd tti tto tts ttt tty tyc tyd tyo tys tyt ybc ybi ybs yby ycc ycd yci yco ycs ycy ydo yds ydt ydy yid yii yio yis yit yob yoc yod yoi yoo yos yot yoy ysb ysc ysi yso yss yst ysy ytc ytd yto yts ytt yyb yyc yys yyt yyy