dddd ddry ddss dfds dfrf dfri didi dids didy dif- diff difs dify diii diis dird dirr dirs dis- disd disi diss disy diyi drif drrs dry- dryf drys dsdr dsif dsri dsrr dssi dydd dyf- dyfi dyr- dyrf dyri dys- dysi dysr dyss dyyr fdry ffff ffii ffrr ffss fidf fids fiff fifi fiii firs firy fisd fisi fiss frid fris frys fsfi fssf fyfi fyrd fyrs fyry idid idir idis idrf idsf idss iffy ifid ifis ifrf ifri iiii iiis iirs iisd iisi iisr irds iri- irid iris iriy irri irrs irsf isds isis isri issf issi issr isss issy isys rfdi rfds rfid ridd ridi rids riff rifs riif riis riri rirs risd risi riss riyf rrif rrrr rsdd rsds rsid rsis rydy ryff ryif ryis rysy ryyf s-ii sdds sdif sdrs sdry sdsf sdss sfss sidd sidi sidr sids sidy siff sifr sify sirf siri sirr sirs sisd sisi siss sisy siyi srfi sris srsd ssdd ssdf ssid ssis ssri ssrs sssf sssi ssss sydi syds syff syfy syis syrs syry syss yidi yids yiff yird yirr yiss ysii yyff yyyy