-ic b-u bbb bbc bbd bbi bbk bbr bbu bcb bcc bcd bci bck bcr bcu bdb bdc bdd bdi bdk bdr bdu bi- bib bic bid bii bik bir biu bkb bkc bkk bkr brb brd bri brk brr bru bub buc bud bui buk bur buu c-- cbb cbc cbd cbi cbk cbr cbu ccb ccc ccd cci cck ccr ccu cdb cdc cdd cdi cdk cdr cdu ci- cib cic cid cii cik cir ciu ckb ckc ckd cki crb crc crd cri crk crr cru cub cuc cud cui cuk cur cuu dbb dbc dbd dbi dbk dbr dbu dcb dcc dcd dci dck dcr dcu ddb ddc ddd ddi ddk ddr ddu di- dib dic did dii dik dir diu dkb dkc dki dkk dkr dku drb drc drd dri drk drr dru dub duc dud dui duk dur i-d ibb ibc ibd ibi ibk ibr ibu icb icc icd ici ick icr icu idb idc idd idi idk idr idu iib iic iid iii iir iiu ikb ikc iki ikk ikr iku ir- irb irc ird iri irk irr iru iu- iub iuc iud iui iur kbb kbc kbd kbi kbk kbr kbu kcb kcc kcd kci kck kcr kcu kdb kdc kdk kdr kdu kib kic kid kii kik kir kiu kkb kkc kki kkk kkr kku krc krd kri krk krr kru kub kuc kud kui kuk kur kuu rbb rbc rbd rbi rbk rbr rbu rcb rcc rcd rci rcr rcu rdb rdc rdd rdi rdr rdu rib ric rid rii rik rir rkb rkc rkk rku rrb rrc rrd rri rrk rrr rru rub ruc rud rui ruk rur ruu ubb ubc ubi ubk ubr ubu ucb ucc ucd uci uck ucr ucu udb udc udd udi udk udr udu uib uic uid uii uir uiu ukb ukc uki ukk ukr uku ur- urb urc urd uri urk urr uru uuc uur uuu