-ic b-u bbb bbc bbi bbo bbs bbu bcb bcc bci bco bcs bcu bi- bib bic bii bio bis biu bob boc boi boo bos bou bsb bsc bsi bso bss bsu bub buc bui buo bus buu c-- cbb cbc cbi cbo cbs cbu ccb ccc cci cco ccs ccu ci- cib cic cii cio cis ciu co- cob coc coi coo cos cou csb csc csi cso css csu cub cuc cui cuo cus cuu ibb ibc ibi ibo ibs ibu icb icc ici ico ics icu iib iic iii iio iis iiu io- iob ioc ioi ioo ios iou is- isb isc isi iso iss isu iu- iub iuc iui ius o-i ob- obb obc obi obo obs obu oc- ocb occ oci oco ocs ocu oib oic oii oio ois oiu oo- oob ooc ooi ooo oos os- osb osc osi oso oss osu ou- ouc oui ouo ous sbb sbc sbi sbo sbs sbu scb scc sci sco scs scu sib sic sii sio sis siu sob soc soi soo sos sou ss- ssb ssc ssi sso sss ssu sub suc sui suo sus suu ubb ubc ubi ubo ubs ubu ucb ucc uci uco ucs ucu uib uic uii uio uis uiu uob uoc uoo uos usb usc usi uso uss usu uuc uus uuu