dddd ddry ddss didi dids didy diii diis dird dirr dirs dis- disd disi diss disy diyi drrs dry- drys dsdr dsri dsrr dssi dydd dyr- dyri dys- dysi dysr dyss dyyr idid idir idis idss iiii iiis iirs iisd iisi iisr irds iri- irid iris iriy irri irrs isds isis isri issi issr isss issy isys ridd ridi rids riis riri rirs risd risi riss rrrr rsdd rsds rsid rsis rydy ryis rysy s-ii sdds sdrs sdry sdss sidd sidi sidr sids sidy siri sirr sirs sisd sisi siss sisy siyi sris srsd ssdd ssid ssis ssri ssrs sssi ssss sydi syds syis syrs syry syss yidi yids yird yirr yiss ysii yyyy