-ol b-u bbb bbc bbd bbk bbl bbo bbu bcb bcc bcd bck bcl bco bcu bdb bdc bdd bdk bdl bdo bdu bkb bkc bkk bkl bko blb blc bld blk bll blo blu bob boc bod bok bol boo bou bub buc bud buk bul buo buu c-- cbb cbc cbd cbk cbl cbo cbu ccb ccc ccd cck ccl cco ccu cdb cdc cdd cdk cdl cdo cdu ckb ckc ckd cko cl- clb clc cld clk cll clo clu co- cob coc cod cok col coo cou cub cuc cud cuk cul cuo cuu dbb dbc dbd dbk dbl dbo dbu dcb dcc dcd dck dcl dco dcu ddb ddc ddd ddk ddl ddo ddu dkb dkc dkk dkl dko dku dl- dlb dlc dld dlk dll dlo dlu dob doc dod dok dol doo dou dub duc dud duk dul duo kbb kbc kbd kbk kbl kbo kbu kcb kcc kcd kck kcl kcu kdb kdc kdk kdl kdo kdu kkb kkc kkk kkl kku kl- klb klc kld klo klu kob koc kod kok kol koo kou kub kuc kud kuk kul kuu lbb lbc lbd lbk lbl lbo lbu lcb lcc lcd lck lcl lco lcu ldb ldc ldd ldk ldl ldo ldu lkb lkl llb llc lld llk lll llo llu lob loc lod lok lol loo lou lub luc lud luk lul luo luu ob- obb obc obd obk obl obo obu oc- ocb occ ocd ock ocl oco ocu odb odc odd odl odo odu okb okc okd okk okl oko oku olb olc old olk oll olo olu oo- oob ooc ood ook ool ooo ou- ouc oud ouk oul ouo ubb ubc ubk ubl ubo ubu ucb ucc ucd uck ucl uco ucu udb udc udd udk udl udo udu ukb ukc ukk ukl uku ulb ulc uld ulk ull ulo ulu uob uoc uod uok uol uoo uuc uuu