bbb bbc bbe bbo bbw bcb bcc bce bco be- beb bec bee beo bew bob boc boe boo bow bwb bwc bwo c-- cbb cbc cbe cbo cbw ccb ccc cce cco ccw ce- ceb cec cee ceo cew co- cob coc coe coo cow cw- cwb cwc cwe cwo ebb ebc ebe ebo ebw ec- ecb ecc ece eco ecw eeb eec eee eeo eew eo- eob eoc eoe eoo eow ewb ewc ewe ewo eww ob- obb obc obe obo obw oc- ocb occ oco ocw oeb oec oee oeo oo- oob ooc ooo oow owb owc owe owo oww wbb wbc wbe wbo wbw wcb wcc wce wco wcw web wec wee weo wew wob woc woe woo wow wwc wwe wwo www