bbb bbc bbe bbg bbn bbo bbt bcb bcc bce bcg bcn bco bct be- beb bec bee beg ben beo bet bgb bgc bge bgg bgn bgo bgt bnb bnc bne bng bnn bno bnt bob boc boe bog bon boo bot btb btc bte btg btn bto btt c-- cbb cbc cbe cbg cbn cbo cbt ccb ccc cce ccg ccn cco cct ce- ceb cec cee ceg cen ceo cet cgb cgc cge cgg cgn cgo cgt cn- cnb cnc cne cng cnn cno cnt co- cob coc coe cog con coo cot ctb ctc cte ctg ctn cto ctt ebb ebc ebe ebg ebn ebo ebt ec- ecb ecc ece ecg ecn eco ect eeb eec eee eeg een eeo eet egb egc ege egg egn ego egt en- enb enc ene eng enn eno ent eo- eob eoc eoe eog eon eoo eot etb etc ete etg etn eto ett gbc gbe gbg gbn gbo gbt gcb gcc gce gcg gcn gco gct ge- geb gec gee geg gen geo get ggb ggc ggg ggn ggo ggt gnb gnc gne gnn gno gnt gob goc goe gog gon goo got gtb gtc gte gtg gtn gto gtt nbb nbc nbe nbg nbn nbo nbt ncb ncc nce ncg ncn nco nct ne- neb nec nee neg nen neo net ngb ngc nge ngg ngn ngo ngt nnb nnc nne nng nnn nno nnt no- nob noc noe nog non noo not ntb ntc nte ntg ntn nto ntt ob- obb obc obe obg obn obo obt oc- ocb occ ocg ocn oco oct oeb oec oee oeg oen oeo oet ogc oge ogg ogn ogo ogt on- onb onc one ong onn ono ont oo- oob ooc oog oon ooo oot ot- otb otc ote otg otn oto ott tbb tbc tbe tbg tbn tbo tbt tcb tcc tce tcg tcn tco tct te- teb tec tee teg ten teo tet tgb tgc tge tgg tgn tgo tgt tnb tnc tne tng tnn tno tnt to- tob toc toe tog ton too tot ttb ttc tte ttg ttn tto ttt