bbbb bblb bbpr bibb bibi bibl bibo bili bill bilo bio- bioi biol bipp birb biri birl biro birr blio blip blir blob bloo blop bobb bobi bobo boi- boii boil boli boll bolo boob bool boop boor bopp bor- bori boro borr bril brio brlp brob brol broo bror brrr ibri ibro iiii iiio iioi iioo iiop ilio ilir ill- illi illo illp iloo ilpr iobi ioii ioio iolo iooi iooo iopl iori ipil iplo ipop ippo ippr ipri irbp iri- iril irio irip irlb irob irop irri lblr libo libr liii liir lilb lili lill lilo lio- lior lip- lipb lipi lipl lipo lipp liri lirl liro lirp lirr llll lloo lob- lobb lobi lobo loir loli loll lolo loob lool loop loor lopi lopp lori loro lppl lprp lroi lrrr obbo oboi obol obor obri obro oiii olbo olib olio olli ollo olor oobi oolo oooo opii opio opo- opor oppi oppo orbb orbi orbo ori- oril orio orlo oro- oror orpi orri orro pbil pibb pibi piip pil- pili pill pilo piob pipi pipo pipp piri pirl piro pirr plbr plib plio plip plob ploo plop plpp plri pobo poil poio poli poll polo pool poop poor pop- popi popo popp porb pori poro porr ppib ppli pplo pppo pppp pri- prii prlr pro- prob prol proo prop prri rbbb rbbr rib- ribo rill rilo rilp riol ripi ripl ripp ripr riri rob- robb robi robo roil roio roir roll rolo rolp roob rooi rool roop roor ropo rori roro rpii rpob rrrr