b-u bbb bbc bbd bbk bbl bbm bbu bcb bcc bcd bck bcl bcm bcu bdb bdc bdd bdk bdl bdm bdu bkb bkc bkk bkl bkm blb blc bld blk bll blm blu bmb bmc bmd bmk bml bmm bmu bub buc bud buk bul bum buu c-- cbb cbc cbd cbk cbl cbm cbu ccb ccc ccd cck ccl ccm ccu cdb cdc cdd cdk cdl cdm cdu ckb ckc ckd ckm cl- clb clc cld clk cll clm clu cmb cmc cmd cmk cml cmm cmu cub cuc cud cuk cul cum cuu dbb dbc dbd dbk dbl dbm dbu dcb dcc dcd dck dcl dcm dcu ddb ddc ddd ddk ddl ddm ddu dkb dkc dkk dkl dkm dku dl- dlb dlc dld dlk dll dlm dlu dmb dmc dmd dmk dml dmm dmu dub duc dud duk dul dum kbb kbc kbd kbk kbl kbm kbu kcb kcc kcd kck kcl kcm kcu kdb kdc kdk kdl kdm kdu kkb kkc kkk kkl kkm kku kl- klb klc kld klm klu kmb kmc kmd kmk kml kmm kmu kub kuc kud kuk kul kum kuu lbb lbc lbd lbk lbl lbm lbu lcb lcc lcd lck lcl lcm lcu ldb ldc ldd ldk ldl ldm ldu lkb lkl llb llc lld llk lll llm llu lmb lmc lmd lmk lml lmm lmu lub luc lud luk lul lum luu mbb mbc mbd mbk mbl mbm mbu mc- mcb mcc mcd mck mcl mcm mcu mdb mdc mdd mdk mdl mdm mdu mkb mkc mkd mkk mkl mkm mku mlb mlc mld mlk mll mlm mlu mmb mmc mmd mmk mml mmm mmu mub muc mud muk mul mum muu ubb ubc ubk ubl ubu ucb ucc ucd uck ucl ucm ucu udb udc udd udk udl udm udu ukb ukc ukk ukl uku ulb ulc uld ulk ull ulm ulu um- umb umc umd uml umm umu uuc uum uuu