bbb bbc bbg bbn bbo bcb bcc bcg bcn bco bgb bgc bgg bgn bgo bnb bnc bng bnn bno bob boc bog bon boo c-- cbb cbc cbg cbn cbo ccb ccc ccg ccn cco cgb cgc cgg cgn cgo cn- cnb cnc cng cnn cno co- cob coc cog con coo gbc gbg gbn gbo gcb gcc gcg gcn gco ggb ggc ggg ggn ggo gnb gnc gnn gno gob goc gog gon goo nbb nbc nbg nbn nbo ncb ncc ncg ncn nco ngb ngc ngg ngn ngo nnb nnc nng nnn nno no- nob noc nog non noo ob- obb obc obg obn obo oc- ocb occ ocg ocn oco ogc ogg ogn ogo on- onb onc ong onn ono oo- oob ooc oog oon ooo