pppn pppo pppp pprf pprm pre- preb pree pref prem pren prep pri- prie prif prii prim prin prnp pro- prob proe prof prom pron proo prop prri prrm rbbb rbbr rebb rebe rebo reeb reef reem reen reep refe reff refi refn refr reif reii reim rein reir reme remi remn remo remp rene reni renn reno reof reop repe repi repo repp repr rere reri rero rfef rfem rib- ribe ribo rief riem rien riep rier rife riff riif riin rime rimi rimm rimo rine rinf rinn rino riom rion ripe ripi ripp ripr rire riri rmif rmon rmrp rnbr rnie rnin rob- robb robe robi robo roen roer rofe roff rofo roif roin roio roir romb rome romi romm romo romp rone roni rono roob roof rooi room roon roop roor rope ropo rore rori roro rpii rpob rpoe rpof rpon rppn rrif rrmp rrrr