-ol b-u bbb bbc bbl bbm bbo bbu bcb bcc bcl bcm bco bcu blb blc bll blm blo blu bmb bmc bml bmm bmo bmu bob boc bol bom boo bou bub buc bul bum buo buu c-- cbb cbc cbl cbm cbo cbu ccb ccc ccl ccm cco ccu cl- clb clc cll clm clo clu cmb cmc cml cmm cmo cmu co- cob coc col com coo cou cub cuc cul cum cuo cuu lbb lbc lbl lbm lbo lbu lcb lcc lcl lcm lco lcu llb llc lll llm llo llu lmb lmc lml lmm lmo lmu lob loc lol lom loo lou lub luc lul lum luo luu m-o mbb mbc mbl mbm mbo mbu mc- mcb mcc mcl mcm mco mcu mlb mlc mll mlm mlo mlu mmb mmc mml mmm mmo mmu mob moc mol mom moo mou mub muc mul mum muu ob- obb obc obl obm obo obu oc- ocb occ ocl ocm oco ocu olb olc oll olm olo olu om- omb omc oml omm omo omu oo- oob ooc ool oom ooo ou- ouc oul oum ouo ubb ubc ubl ubo ubu ucb ucc ucl ucm uco ucu ulb ulc ull ulm ulo ulu um- umb umc uml umm umo umu uob uoc uol uom uoo uuc uum uuu