-ic bbb bbc bbg bbi bbo bbt bcb bcc bcg bci bco bct bgb bgc bgg bgi bgo bgt bi- bib bic big bii bio bit bob boc bog boi boo bot btb btc btg bti bto btt c-- cbb cbc cbg cbi cbo cbt ccb ccc ccg cci cco cct cgb cgc cgg cgi cgo cgt ci- cib cic cig cii cio cit co- cob coc cog coi coo cot ctb ctc ctg cti cto ctt gbc gbg gbi gbo gbt gcb gcc gcg gci gco gct ggb ggc ggg ggi ggo ggt gib gic gig gii gio git gob goc gog goi goo got gtb gtc gtg gti gto gtt ibb ibc ibg ibi ibo ibt icb icc icg ici ico ict igb igc igg igi igo igt iib iic iii iio iit io- iob ioc iog ioi ioo iot itb itc itg iti ito itt o-i ob- obb obc obg obi obo obt oc- ocb occ ocg oci oco oct ogc ogg ogi ogo ogt oib oic oii oio oit oo- oob ooc oog ooi ooo oot ot- otb otc otg oti oto ott tbb tbc tbg tbi tbo tbt tcb tcc tcg tci tco tct tgb tgc tgg tgi tgo tgt tib tic tig tii tio tit to- tob toc tog toi too tot ttb ttc ttg tti tto ttt