bbbb bbeb bebb bebe bebo beeb beer beo- beor bere bero berr beze bobb bobe bobo boee boeo boer boob booe boor booz bor- bore boro borr borz bozo breb bree breo brer brez brob broe broo bror broz brrr bzer bzoe bzzz ebbo ebbr eber eboe eboo ebor ebro eeee eero eeze eore erbb erbe ereb erer erez erob eroe eroo erre erro ezer ezzo o-eo obbo ober oboe obor obre obro oere oobe ooer oooo oore ooze orbb orbe orbo ore- oreb oreo orer oro- oroe oror oroz orro orzo ozee ozer rbbb rbbr rebb rebe rebo reeb rere rero reze rob- robb robe robo roer roob roor rooz rore roro roze rozz rrrr z-ro zber zebe zero zeze zobo zoo- zorb zore zoro zozo zrze zzzz