prae- prana prane praoe praxe preef preen preff prene preon preop prepa prepn proap proba probe probo proer profe proff prone proof proor prop- prope propn propp propr prora prore ra-ra raaba raabe raaff raaor rabab raban rabap rabba rabbe rabon rabor raeff rafar rafer raffa raffe ranae ranap ranax ranee ranen ranna ranno ranon rapae rapar rapee rapen raper rapex rapon rapor rappa rarae raraf rareb raree rarer raron raxar reafe reane reano reape rear- rebab reban rebar rebbe reber rebon rebop rebox rebra reean reefa reefe reena reene reepe reere refan refar refax refen refer reffe reffo refne renan renbp renea renee rener renfe renna renne renno reno- reone reorx repar repen repno repop repor reppe repro reran rere- reree rerob rexea rexen rexer rexon rfxap rnpep ro-ro roabe roana roane roann robab robar robbe robbo roben rober robo- robon robop robor roera roero roffa roffe rofor ronan ronee ronen roneo ronne ronno rooba rooer roofe roone roopa roope roore ropar roper roppe rorer rorra roxan roxen rperf rprop rrape x-bar x-box x-fab x-fen x-one xaero xanax xaraf xaren xarre xbxrx xebra xeno- xenoa xenon xepon xerbo xero- xerox xexex xoana xonox xorro xoxox