bbbb bblb bhor blob bloo bobb bobo bohl boho bohr boll bolo boob booh bool boor bor- borh boro borr brob broh brol broo bror brrr hhhh hobo hohl hoho hol- holb holh holl holo hool hoor horl horo horr hrbl hrob lblr lhhh lhor llll lloo lob- lobb lobh lobo loho lohr loll lolo loob lool loor loro lrrr obbo obol obor obrh obro ohho ohob ohoh olbo ollo olor ooho oolo oooh oooo orbb orbo orlo oro- oror orro rbbb rbbr rboh rhob rhoh rob- robb robo rohl rohr roll rolo roob rool roor roro rrrr