bbb bbc bbn bbo bbw bby bcb bcc bcn bco bcy bnb bnc bnn bno bnw bob boc bon boo bow boy bwb bwc bwo bwy by- byc byn byo c-- cbb cbc cbn cbo cbw cby ccb ccc ccn cco ccw cn- cnb cnc cnn cno cnw cny co- cob coc con coo cow coy cw- cwb cwc cwn cwo cyb cyc cyn cyo cyw nbb nbc nbn nbo nbw ncb ncc ncn nco ncw nnb nnc nnn nno nnw no- nob noc non noo now noy nwb nwc nwn nwo nyc nyn nyo nyy ob- obb obc obn obo obw oby oc- ocb occ ocn oco ocw on- onb onc onn ono ony oo- oob ooc oon ooo oow owb owc own owo oww oyo wbb wbc wbn wbo wbw wcb wcc wcn wco wcw wn- wnc wnn wno wnw wny wob woc won woo wow woy wwc wwn wwo www wy- wyc wyn wyo ybc yby ycc yco ycw ycy ynn yny yob yoc yon yoo yow yoy ywc yyb yyc yyy