dddd ddss dfds didi dids didu dif- diff difs diii diis dis- disd disi diss dius dsif dssi dudd duds dudu duff dufu duid duif duis dusi ffff ffii ffss fidf fids fiff fifi fiii fisd fisi fiss fisu fsfi fssf fudd fudi fuff fufu fuid fusd fusi fuss fusu idid idis idsf idss idus ifid ifis iiii iiis iisd iisi iisu isds isis issf issi isss issu isus iuds iuiu iusd iuss s-ii sdds sdif sdsf sdss sdsu sfss sfsu sidd sidi sids siff sifu sisd sisi siss sisu siui sius ssdd ssdf ssid ssis sssf sssi ssss sudd sudi suds suf- suff sufi sufs sufu suid suis sus- susd susi suss susu suus uddi udds udid udsd uisd usdf usds usfi usfs usif usis ussf usss ussu usui usus uusi uuuu