iiii iiio iiis iioi iioo iios iirs iisi iisr ioii ioio iooi iooo ioos iori iors ioso iri- irio iris irix iriy irri irrs isis iso- isor isos isri issi isso issr isss issy isys ixos ixxi iyos oiii oios oiry oooo ooos oory oosi ori- orio oris orix oro- oror oros oroy orri orro orrs orry orsi orso orsy orys oryx osii osis osoi osoo osor osos osro ossi osso ossy oxi- oxis oxo- oxos oxox oxsi oxxo oxy- oyri oyss riis rios riri rirs risi riso riss rixo rixy riyo roio roir rois rooi roor roos roox rori roro rory rosi roso ross rosy roxo roxy roys rrrr rsis rsos ryis rysy s-ii s-os sior sios siox siri siro sirr sirs sisi siss sisy sixo sixx siyi soir sois soor soos sooy sori soro sorr sors sory sosi soso soss soxs soyo soys sris sros ssis ssri ssrs sssi ssss syis syro syrs syry syso syss xiii xisi xixi xois xoro xors xoxo xoyo xxii xxix xxxi xxxo xxxx xxxy xyr- yirr yiss yoix yori yoro yory yosi yoso yoyo ysii yyyy