bbbb bbpr bibb bibi bibo biji bio- bioi bipp birb biri biro birr bobb bobi bobo boi- boii boji bojo boob boop boor bopp bor- bori borj boro borr brio brob broo bror brrr ibri ibro iiii iiio iioi iioo iiop ijji iobi ioii ioio iooi iooo iori ipop ippo ippr ipri irbp iri- irio irip irob irop irri j-ro jbob jibb jibi jiji jiri jiro jobo joio joji jojo joor joro jpip jpop jrbr obbo oboi obor obri obro oiii oobi ooij ooji oooo opii opio opo- opoj opor oppi oppo orbb orbi orbo ori- orio orji oro- oror orpi orri orro pibb pibi piip piob pipi pipo pipp piri piro pirr pobo poio poji pojo poop poor pop- popi popo popp porb pori poro porr ppib pppo pppp pri- prii pro- prob proj proo prop prri rbbb rbbr rbpj rib- ribo riji rijo rijp ripi ripp ripr riri rob- robb robi robo roio roir roji rojo roob rooi roop roor ropo rori roro rpii rpob rrrr