-ic b-u bbb bbc bbd bbi bbu bcb bcc bcd bci bcu bdb bdc bdd bdi bdu bi- bib bic bid bii biu bub buc bud bui buu c-- cbb cbc cbd cbi cbu ccb ccc ccd cci ccu cdb cdc cdd cdi cdu ci- cib cic cid cii ciu cub cuc cud cui cuu dbb dbc dbd dbi dbu dcb dcc dcd dci dcu ddb ddc ddd ddi ddu di- dib dic did dii diu dub duc dud dui i-d ibb ibc ibd ibi ibu icb icc icd ici icu idb idc idd idi idu iib iic iid iii iiu iu- iub iuc iud iui ubb ubc ubi ubu ucb ucc ucd uci ucu udb udc udd udi udu uib uic uid uii uiu uuc uuu