-ic b-u bbb bbc bbd bbi bbo bbr bbs bbu bcb bcc bcd bci bco bcr bcs bcu bdb bdc bdd bdi bdo bdr bds bdu bi- bib bic bid bii bio bir bis biu bob boc bod boi boo bor bos bou brb brd bri bro brr brs bru bsb bsc bsd bsi bso bsr bss bsu bub buc bud bui buo bur bus buu c-- cbb cbc cbd cbi cbo cbr cbs cbu ccb ccc ccd cci cco ccr ccs ccu cdb cdc cdd cdi cdo cdr cds cdu ci- cib cic cid cii cio cir cis ciu co- cob coc cod coi coo cor cos cou crb crc crd cri cro crr crs cru csb csc csd csi cso csr css csu cub cuc cud cui cuo cur cus cuu dbb dbc dbd dbi dbo dbr dbs dbu dcb dcc dcd dci dco dcr dcs dcu ddb ddc ddd ddi ddo ddr dds ddu di- dib dic did dii dio dir dis diu dob doc dod doi doo dor dos dou drb drc drd dri dro drr drs dru dsb dsc dsd dsi dso dsr dss dsu dub duc dud dui duo dur dus i-d ibb ibc ibd ibi ibo ibr ibs ibu icb icc icd ici ico icr ics icu idb idc idd idi ido idr ids idu iib iic iid iii iio iir iis iiu io- iob ioc iod ioi ioo ior ios iou ir- irb irc ird iri iro irr irs iru is- isb isc isd isi iso isr iss isu iu- iub iuc iud iui iur ius o-i ob- obb obc obd obi obo obr obs obu oc- ocb occ ocd oci oco ocr ocs ocu odb odc odd odi odo odr ods odu oib oic oid oii oio oir ois oiu oo- oob ooc ood ooi ooo oor oos or- orb orc ord ori oro orr ors oru os- osb osc osd osi oso osr oss osu ou- ouc oud oui ouo our ous rbb rbc rbd rbi rbo rbr rbs rbu rcb rcc rcd rci rco rcr rcs rcu rdb rdc rdd rdi rdo rdr rds rdu rib ric rid rii rio rir ris rob roc rod roi roo ror ros rou rrb rrc rrd rri rrr rrs rru rsb rsc rsd rsi rso rsr rss rsu rub ruc rud rui ruo rur rus ruu sbb sbc sbd sbi sbo sbr sbs sbu scb scc scd sci sco scr scs scu sdb sdc sdd sdi sdo sdr sds sdu sib sic sid sii sio sir sis siu sob soc sod soi soo sor sos sou sr- srb src srd sri sro srr srs ss- ssb ssc ssd ssi sso ssr sss ssu sub suc sud sui suo sur sus suu ubb ubc ubi ubo ubr ubs ubu ucb ucc ucd uci uco ucr ucs ucu udb udc udd udi udo udr uds udu uib uic uid uii uio uir uis uiu uob uoc uod uoo uor uos ur- urb urc urd uri uro urr urs uru usb usc usd usi uso usr uss usu uuc uur uus uuu