-th bbb bbc bbe bbh bbo bbt bcb bcc bce bch bco bct be- beb bec bee beh beo bet bhb bhc bhe bhh bho bht bob boc boe boh boo bot btb btc bte bth bto btt c-- cbb cbc cbe cbh cbo cbt ccb ccc cce cch cco cct ce- ceb cec cee ceh ceo cet ch- chb chc che chh cho cht co- cob coc coe coh coo cot ctb ctc cte cth cto ctt ebb ebc ebe ebh ebo ebt ec- ecb ecc ece ech eco ect eeb eec eee eeo eet ehb ehc ehe ehh eho eht eo- eob eoc eoe eoh eoo eot etb etc ete eth eto ett hbb hbc hbe hbh hbo hbt hcb hcc hce hch hco hct he- heb hec hee heh heo het hhb hhc hhe hhh hho hht hob hoc hoe hoh hoo hot htb htc hte hth hto htt ob- obb obc obe obh obo obt oc- ocb occ och oco oct oeb oec oee oeh oeo oet ohc ohe ohh oho oht oo- oob ooc ooh ooo oot ot- otb otc ote oth oto ott tbb tbc tbe tbh tbo tbt tcb tcc tce tch tco tct te- teb tec tee teh teo tet th- thb thc the thh tho tht to- tob toc toe toh too tot ttb ttc tte tth tto ttt