-ol b-u bbb bbc bbd bbl bbo bbt bbu bcb bcc bcd bcl bco bct bcu bdb bdc bdd bdl bdo bdt bdu blb blc bld bll blo blt blu bob boc bod bol boo bot bou btb btc btd btl bto btt btu bub buc bud bul buo but buu c-- cbb cbc cbd cbl cbo cbt cbu ccb ccc ccd ccl cco cct ccu cdb cdc cdd cdl cdo cdt cdu cl- clb clc cld cll clo clt clu co- cob coc cod col coo cot cou ctb ctc ctd ctl cto ctt ctu cub cuc cud cul cuo cut cuu dbb dbc dbd dbl dbo dbt dbu dcb dcc dcd dcl dco dct dcu ddb ddc ddd ddl ddo ddt ddu dl- dlb dlc dld dll dlo dlt dlu dob doc dod dol doo dot dou dtb dtc dtd dtl dto dtt dtu dub duc dud dul duo dut lbb lbc lbd lbl lbo lbt lbu lcb lcc lcd lcl lco lct lcu ldb ldc ldd ldl ldo ldt ldu llb llc lld lll llo llt llu lob loc lod lol loo lot lou ltb ltc ltd ltl lto ltt ltu lub luc lud lul luo lut luu ob- obb obc obd obl obo obt obu oc- ocb occ ocd ocl oco oct ocu odb odc odd odl odo odt odu olb olc old oll olo olt olu oo- oob ooc ood ool ooo oot ot- otb otc otd otl oto ott otu ou- ouc oud oul ouo out tbb tbc tbd tbl tbo tbt tbu tcb tcc tcd tcl tco tct tcu tdb tdc tdd tdl tdo tdt tdu tlc tld tll tlo tlt tlu to- tob toc tod tol too tot tou ttb ttc ttd ttl tto ttt ttu tub tuc tud tul tuo tut tuu ubb ubc ubl ubo ubt ubu ucb ucc ucd ucl uco uct ucu udb udc udd udl udo udt udu ulb ulc uld ull ulo ult ulu uob uoc uod uol uoo uot utb utc utd utl uto utt utu uuc uut uuu