iiii iiio iiis iioi iioo iios iirs iisi iisr ioii ioio iooi iooo ioos iori iors ioso iri- irio iris irri irrs isis iso- isor isos isri issi isso issr isss oiii oios oooo ooos oosi ori- orio oris oro- oror oros orri orro orrs orsi orso osii osis osoi osoo osor osos osro ossi osso riis rios riri rirs risi riso riss roio roir rois rooi roor roos rori roro rosi roso ross rrrr rsis rsos s-ii s-os sior sios siri siro sirr sirs sisi siss soir sois soor soos sori soro sorr sors sosi soso soss sris sros ssis ssri ssrs sssi ssss