-ic bbb bbc bbe bbi bbo bcb bcc bce bci bco be- beb bec bee bei beo bi- bib bic bie bii bio bob boc boe boi boo c-- cbb cbc cbe cbi cbo ccb ccc cce cci cco ce- ceb cec cee cei ceo ci- cib cic cie cii cio co- cob coc coe coi coo ebb ebc ebe ebi ebo ec- ecb ecc ece eci eco eeb eec eee eeo eib eic eie eii eio eo- eob eoc eoe eoi eoo ibb ibc ibe ibi ibo icb icc ice ici ico ie- iec iee iei iib iic iie iii iio io- iob ioc ioe ioi ioo o-i ob- obb obc obe obi obo oc- ocb occ oci oco oeb oec oee oei oeo oib oic oie oii oio oo- oob ooc ooi ooo