bbb bbm bbo bbt bmb bmm bmo bmt bmv bob bom boo bot bov btb btm bto btt btv bvb bvm bvo bvt bvv m-o m-v mbb mbm mbo mbt mbv mmb mmm mmo mmt mmv mob mom moo mot mov mtb mtm mto mtt mtv mvb mvm mvo mvt mvv ob- obb obm obo obt obv om- omb omm omo omt omv oo- oob oom ooo oot oov ot- otb otm oto ott otv ov- ovb ovo ovv tbb tbm tbo tbt tbv tmb tmm tmo tmt tmv to- tob tom too tot tov ttb ttm tto ttt ttv tvb tvm tvo tvt vbm vbo vbv vm- vmm vmo vmt vob vom voo vot vov vtb vtm vto vtt vtv vvb vvm vvo vvt vvv