a-ii aaaa aaai aaap aaar aaas aaii aais aapa aapi aaps aara aari aarp aars aasa aasi aass aiai aias aiia aiir aipa aipi aips aira airi airp airs aisa aisi aisr apai apap apar apas api- apia apip apis appa appr apps apra apri aprs apsa apsi apss arai arap arar aras aria arii arip aris arpa arpi arps arr- arra arri arrr arrs ars- arsa arsi asaa asai asap asar asas asia asii asip asir asis aspa aspi aspr asps asra asrs assa assi assp assr asss iaaa iaai iaap iaas iaia iais iapa iapp iaps iara iars iasa iasi iasp iasr iias iiii iiis iipa iira iirs iisi iisp iisr ipas ippa ippr ipri ipsa ipsi ipsp ipss irai irap irar iras iri- iria irip iris irpa irps irra irri irrs irsa irsp is-a isai isar isas isia isis ispa ispr isps isra isri isrp issa issi issp issr isss paap paar paas paia paip pair pais papa papi papp papr paps par- para pari parp parr pars pasa pasi pasp pass piai pias piia piip pipa pipi pipp pips pira piri pirr pirs pisa pisi piss ppap ppar pppa pppp ppps ppss prai prar pras pri- pria prii pris prps prri prrs prsa prsi prss psap psas psia psip psis pspi pspp pspr psps psrp pssa raas raia raii raip rair rais rapa rapi rapp raps rara rari rars rasa rasi rasp rass riaa riai rias riia riis ripa ripi ripp ripr rips riri rirs risa risi risp riss rpii rpps rras rrrr rrsp rsaa rsai rsis rsps rssa s-ii saap saar saas saia saip sair sais sapa sapi sapp saps sara sari sarp sarr sars sasa sasi sass siaa siai sias sipa sipi sipp sips sira siri sirp sirr sirs sisa sisi siss sp-a spap spar spas spia spip spir spis spps spri sprs spsa spsp spss sras sris srps srsp ssaa ssap ssas ssis sspa ssps ssra ssri ssrs sssa sssi ssss