-ic b-u bbb bbc bbi bbo bbr bbu bcb bcc bci bco bcr bcu bi- bib bic bii bio bir biu bob boc boi boo bor bou brb bri bro brr bru bub buc bui buo bur buu c-- cbb cbc cbi cbo cbr cbu ccb ccc cci cco ccr ccu ci- cib cic cii cio cir ciu co- cob coc coi coo cor cou crb crc cri cro crr cru cub cuc cui cuo cur cuu ibb ibc ibi ibo ibr ibu icb icc ici ico icr icu iib iic iii iio iir iiu io- iob ioc ioi ioo ior iou ir- irb irc iri iro irr iru iu- iub iuc iui iur o-i ob- obb obc obi obo obr obu oc- ocb occ oci oco ocr ocu oib oic oii oio oir oiu oo- oob ooc ooi ooo oor or- orb orc ori oro orr oru ou- ouc oui ouo our rbb rbc rbi rbo rbr rbu rcb rcc rci rco rcr rcu rib ric rii rio rir rob roc roi roo ror rou rrb rrc rri rrr rru rub ruc rui ruo rur ruu ubb ubc ubi ubo ubr ubu ucb ucc uci uco ucr ucu uib uic uii uio uir uiu uob uoc uoo uor ur- urb urc uri uro urr uru uuc uur uuu