Explode the Code Book 6 introduces students to r-controlled vowels, silent letters, and vowel diphthongs and is ideal for students in grades 2-4. Skills addressed through a variety of encoding, decoding, and writing exercises include the r-controlled vowels ar, or, er, ir, ur, war, wor,silent letters -igh, and vowel diphthongs oo, ea, ie, oi, oy, ou, ow, au, aw, ew, ui, ue. Students will also practice blending sounds to read and write multi-syllabic words. Three review lessons are included along with a posttest.