bbbb bbbs bibb bibi bibo bibs biis biji bijs bio- bioi bios bis- biso biss bobb bobi bobo bobs boi- boii bois boji bojo boob boos bosi boso boss bsos ibis ibos ibss iiii iiio iiis iioi iioo iios iisi iisj ijji iobi ioii ioio iooi iooo ioos ioso isis iso- isos issi isso isss jbob jibb jibi jibs jiji jiso jobo jobs joio jois joji jojo joos joso joss jsss obbo obis oboi obos obss oiii oios ojos oobi ooij ooji oooo ooos oosi osii osis osoi osoo osos ossb ossi osso s-ib s-ii s-os sbbs sbsi sibi sibo sibs sijo sios sisi siss sjis sobo sobs sois soji soos sosi soso soss ssis sssb sssi ssss