-th bbb bbc bbe bbh bbn bbo bbt bcb bcc bce bch bcn bco bct be- beb bec bee beh ben beo bet bhb bhc bhe bhh bho bht bnb bnc bne bnn bno bnt bob boc boe boh bon boo bot btb btc bte bth btn bto btt c-- cbb cbc cbe cbh cbn cbo cbt ccb ccc cce cch ccn cco cct ce- ceb cec cee ceh cen ceo cet ch- chb chc che chh chn cho cht cn- cnb cnc cne cnh cnn cno cnt co- cob coc coe coh con coo cot ctb ctc cte cth ctn cto ctt ebb ebc ebe ebh ebn ebo ebt ec- ecb ecc ece ech ecn eco ect eeb eec eee een eeo eet ehb ehc ehe ehh ehn eho eht en- enb enc ene enh enn eno ent eo- eob eoc eoe eoh eon eoo eot etb etc ete eth etn eto ett hbb hbc hbe hbh hbn hbo hbt hcb hcc hce hch hcn hco hct he- heb hec hee heh hen heo het hhb hhc hhe hhh hhn hho hht hnb hnc hne hnh hnn hno hnt hob hoc hoe hoh hon hoo hot htb htc hte hth htn hto htt nbb nbc nbe nbn nbo nbt ncb ncc nce nch ncn nco nct ne- neb nec nee neh nen neo net nhb nhc nhe nhh nhn nht nnb nnc nne nnh nnn nno nnt no- nob noc noe noh non noo not ntb ntc nte nth ntn nto ntt ob- obb obc obe obh obn obo obt oc- ocb occ och ocn oco oct oeb oec oee oeh oen oeo oet ohc ohe ohh ohn oho oht on- onb onc one onh onn ono ont oo- oob ooc ooh oon ooo oot ot- otb otc ote oth otn oto ott tbb tbc tbe tbh tbn tbo tbt tcb tcc tce tch tcn tco tct te- teb tec tee teh ten teo tet th- thb thc the thh thn tho tht tnb tnc tne tnh tnn tno tnt to- tob toc toe toh ton too tot ttb ttc tte tth ttn tto ttt