-ic b-u bbb bbc bbd bbe bbi bbk bbo bbu bcb bcc bcd bce bci bck bco bcu bdb bdc bdd bde bdi bdk bdo bdu be- beb bec bed bee bei bek beo beu bi- bib bic bid bie bii bik bio biu bkb bkc bke bkk bko bob boc bod boe boi bok boo bou bub buc bud bue bui buk buo buu c-- cbb cbc cbd cbe cbi cbk cbo cbu ccb ccc ccd cce cci cck cco ccu cdb cdc cdd cde cdi cdk cdo cdu ce- ceb cec ced cee cei cek ceo ceu ci- cib cic cid cie cii cik cio ciu ckb ckc ckd cki cko co- cob coc cod coe coi cok coo cou cub cuc cud cue cui cuk cuo cuu dbb dbc dbd dbe dbi dbk dbo dbu dcb dcc dcd dce dci dck dco dcu ddb ddc ddd dde ddi ddk ddo ddu de- deb dec ded dee dei dek deo deu di- dib dic did die dii dik dio diu dkb dkc dke dki dkk dko dku dob doc dod doe doi dok doo dou dub duc dud due dui duk duo ebb ebc ebd ebe ebi ebk ebo ebu ec- ecb ecc ecd ece eci eck eco ecu ed- edb edc edd ede edi edk edo edu eeb eec eed eee eek eeo eib eic eid eie eii eik eio eiu ekb ekc ekd eke eki eko eku eo- eob eoc eod eoe eoi eok eoo eou eu- eub euc eud eue eui i-d ibb ibc ibd ibe ibi ibk ibo ibu icb icc icd ice ici ick ico icu idb idc idd ide idi idk ido idu ie- iec ied iee iei iek iib iic iid iie iii iio iiu ikb ikc ike iki ikk iko iku io- iob ioc iod ioe ioi ioo iou iu- iub iuc iud iue iui kbb kbc kbd kbe kbi kbk kbo kbu kcb kcc kcd kce kci kck kcu kdb kdc kde kdk kdo kdu ke- keb kec ked kee kei kek keo kib kic kid kie kii kik kio kiu kkb kkc kke kki kkk kku kob koc kod koe koi kok koo kou kub kuc kud kue kui kuk kuu o-i ob- obb obc obd obe obi obk obo obu oc- ocb occ ocd oci ock oco ocu odb odc odd ode odi odo odu oeb oec oed oee oei oeo oib oic oid oie oii oik oio oiu okb okc okd oke oki okk oko oku oo- oob ooc ood ooi ook ooo ou- ouc oud oue oui ouk ouo ubb ubc ube ubi ubk ubo ubu ucb ucc ucd uce uci uck uco ucu udb udc udd ude udi udk udo udu ueb uec ued uee uei uib uic uid uie uii uio uiu ukb ukc uke uki ukk uku uob uoc uod uoe uok uoo uuc uue uuu