prbs pre- preb pree prel prep pres prle prlr prls pro- proa prob proe prol proo prop pros prps prrs prsa prse prsl prso prss psap psas psbr pseb psel psoa psol psos pspp pspr psps psrp pssa psse psso raab raas raba rabb rabe rabl rabo rabs rael raep raer raes rala ralb rale rall ralo raob raol raop raos rapa rape rapl rapp raps rara rarb rare raro rars rasa rase rasl raso rasp rass rbbb rbbr rbbs rble rbsl rbsp rbss rea- reae real reao reap rear reas reba rebb rebe rebo rebs reeb reel reep rees rela relb rele rell relo relp rels reol reop reos repe repl repo repp repr reps rera rere rero rers resa rese reso resp ress rlab rlee rlls roab roap roar roas rob- roba robb robe robo robs roea roel roer roes rola role roll rolo rolp roob rool roop roor roos ropa rope ropo rops rora rore roro rosa rose roso rosp ross rpls rpob rpoe rpos rpps rras rrle rrrr rrsp rsaa rsee rslp rsos rspb rspo rsps rsre rssa rssl s-os saab saae saal saap saar saas saba sabb sabe sabo sabr sabs saeb sael saer saes sala sale sall salo salp sals saol saor saos sapa sape sapo sapp saps sara sare sarl saro sarp sarr sars sasa sase sasl saso sass sbaa sbar sbas sbbs sber sbor sbsa sbse sbsp se-e se-o se-s seaa seab seal seap sear seas seba sebe sebo sebs seea seeb seel seep seer sees sela selb sele sell selo sels seol seop sepa sepe sepo sepp sepr seps sera serb sere sero serp serr sers sesa sese seso sess slaa slab slae slap slas slbp slea sleb slee slep sler sles sllp slob sloe sloo slop slos slpp slps slre slrp slrs slsa soal soap soar soas soba sobe sobo sobp sobr sobs soea soel soeo soep soes sola sole soll solo solp solr sols sool soop soor soos sopa sope sopo sopp sops sora sorb sore soro sorr sors sosa sose soso soss sp-a spae spal spap spar spas spea speb spee spel sper spes spla sple splo splp splr spls spoo spop spor spos spps spro sprs spsa spse spso spsp spss sras sreb sreo sres sros srps srsp ssaa ssab ssao ssap ssas ssbr ssee ssep sses ssla ssle sslp ssop sspa sspe sspl sspo ssps ssra ssrl ssrs sssa sssb ssss