dddd ddps ddss ddts didi dids diii diis dipp dips dipt dird dirr dirs dirt dis- disd disi disp diss dist diti dits ditt dpdt dpsd dpst dpts drip drit drrs drsp dsdp dsdr dsip dsps dspt dsri dsrp dsrr dssi dssp dsst dsts dtdp dtss dttp idid idir idis idps idss idtp idts iiii iiis iiit iirs iisd iisi iisp iisr iist iitr iitt ipdi ipid ippr ipri ipsi ipsp ipss ipts irdp irds iri- irid irip iris irps irri irrs irsp irti irtp irts isds isis isit ispr isps isri isrp issi issp issr isss istd isti istp istr ists itis itri itrs itsi itsp pdpr pdrs pdsd pdss pids piip pipi pipp pips piri pirr pirs pisd pisi piss pist piti pitr pits pitt ppds ppid pppd pppp ppps ppss ppts pptt pri- prid prii pris prpd prps prrd prri prrs prsd prsi prss prti prtp prtr psdi psdp psdr psds psid psip psis pspi pspp pspr psps psrd psrp psst psts ptpd ptrd ptsd ridd ridi rids riis ripd ripi ripp ripr rips ript riri rirs risd risi risp riss rist riti rits ritt rpdp rpii rpps rptd rpts rrrr rrsp rsdd rsds rsid rsis rsps rstp rsts rtdt rtps rtss rttp rtts s-ii sdds sdpr sdps sdrs sdss sidd sidi sidr sids siit sipi sipp sips sipt siri sirp sirr sirs sirt sisd sisi siss sist sit- sitd siti sits sitt spdp spdr spdt spip spir spis spit sppd spps sprd spri sprs spsd spsp spss spst sptr spts sris srps srpt srsd srsp srtp srtr ssdd ssdp ssid ssis ssit ssps sspt ssri ssrs sssi ssss sstd sstp ssts stds stid stip stir stis stit stpd stpp stps strd stri strs stsi stss sttd sttr tdis tdri tdss tidd tids tiit tip- tipi tipp tips tipt tird tiri tirr tirs tisi tiss tist titi titp tits titt tpir tppd tppp tppr tprs tptp tptr tri- trip tris trit trpp trps trsd trsi trst trtr tsid tsis tsps tspt tssi tssr tsst tsts ttss tttt