Vowel Diphthong "ui" This is a multisensory lesson for students developing reading and writing skills. The file is a 12 page PDF document with an answer key. Please review the preview document before purchasing to ensure it meets your students' needs. Missing from the preview is the answer key - the answer key is listed on page 12 of the PDF file of the full multisensory lesson. A multisensory approach to phonogram development, "ui." Use of multisensory Orton Gillingham principles a