bbbb bblb bbpr bhor bhpl blob bloo blop bobb bobo bohl boho bohr boll bolo boob booh bool boop boor bopp bor- borh boro borr brlp brob broh brol broo bror brrr hhhh hobo hohl hoho hol- holb holh holl holo holp hool hoop hoor hopo hopp horl horo horr hrbl hrob hrpp lblr lhhh lhor llll lloo lob- lobb lobh lobo loho lohr loll lolo loob lool loop loor lopp loro lppl lprp lrrr obbo obol obor obrh obro ohho ohob ohoh olbo ollo olor olph ooho oolo oooh oooo opo- opor oppo orbb orbo orlo oro- oror orph orro phlo phob phoh phoo phrr plbr plob ploh ploo plop plpp pobo pohl poll polo pooh pool poop poor pop- popo popp porb poro porr pplo pppo pppp prhl prlr pro- prob prol proo prop rbbb rbbr rboh rhob rhoh rob- robb robo rohl rohr roll rolo rolp roob rool roop roor ropo roro rpho rpob rrrr