-ic b-u bbb bbc bbd bbi bbr bbt bbu bcb bcc bcd bci bcr bct bcu bdb bdc bdd bdi bdr bdt bdu bi- bib bic bid bii bir bit biu brb brd bri brr brt bru btb btc btd bti btr btt btu bub buc bud bui bur but buu c-- cbb cbc cbd cbi cbr cbt cbu ccb ccc ccd cci ccr cct ccu cdb cdc cdd cdi cdr cdt cdu ci- cib cic cid cii cir cit ciu crb crc crd cri crr crt cru ctb ctc ctd cti ctr ctt ctu cub cuc cud cui cur cut cuu dbb dbc dbd dbi dbr dbt dbu dcb dcc dcd dci dcr dct dcu ddb ddc ddd ddi ddr ddt ddu di- dib dic did dii dir dit diu drb drc drd dri drr drt dru dtb dtc dtd dti dtr dtt dtu dub duc dud dui dur dut i-d ibb ibc ibd ibi ibr ibt ibu icb icc icd ici icr ict icu idb idc idd idi idr idt idu iib iic iid iii iir iit iiu ir- irb irc ird iri irr irt iru itb itc itd iti itt itu iu- iub iuc iud iui iur iut rbb rbc rbd rbi rbr rbt rbu rcb rcc rcd rci rcr rct rcu rdb rdc rdd rdi rdr rdt rdu rib ric rid rii rir rit rrb rrc rrd rri rrr rrt rru rtb rtc rtd rti rtr rtt rtu rub ruc rud rui rur rut ruu tbb tbc tbd tbi tbr tbt tbu tcb tcc tcd tci tcr tct tcu tdb tdc tdd tdi tdr tdt tdu tib tic tid tii tir tit tiu trb trc trd tri trr trt tru ttb ttc ttd tti ttr ttt ttu tub tuc tud tui tur tut tuu ubb ubc ubi ubr ubt ubu ucb ucc ucd uci ucr uct ucu udb udc udd udi udr udt udu uib uic uid uii uir uit uiu ur- urb urc urd uri urr urt uru utb utc utd uti utr utt utu uuc uur uut uuu