-ic bbb bbc bbe bbf bbi bbo bcb bcc bce bcf bci bco be- beb bec bee bef bei beo bfb bfc bfe bff bfi bfo bi- bib bic bie bif bii bio bob boc boe bof boi boo c-- cbb cbc cbe cbf cbi cbo ccb ccc cce ccf cci cco ce- ceb cec cee cef cei ceo cfb cfc cfe cff cfi cfo ci- cib cic cie cif cii cio co- cob coc coe cof coi coo ebb ebc ebe ebf ebi ebo ec- ecb ecc ece ecf eci eco eeb eec eee eef eeo ef- efb efc efe eff efi efo eib eic eie eif eii eio eo- eob eoc eoe eof eoi eoo fbb fbc fbe fbf fbi fbo fcb fcc fce fcf fci fco feb fec fee fef fei feo ffc ffe fff ffi ffo fib fic fie fif fii fob foc foe fof foi foo i-f ibb ibc ibe ibf ibi ibo icb icc ice icf ici ico ie- iec iee ief iei ifb ifc ife iff ifi ifo iib iic iie iif iii iio io- iob ioc ioe iof ioi ioo o-i ob- obb obc obe obf obi obo oc- ocb occ ocf oci oco oeb oec oee oef oei oeo of- ofb ofc ofe off ofi ofo oib oic oie oif oii oio oo- oob ooc oof ooi ooo