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Book 4 moves on to accents, more complicated prefix and suffix work, contractions, possessives, compound words, and calendar and measurement words. Lessons also cover consonant digraphs, plural words, and irregular spellings. In addition, often challenging word endings are included, such as “el, le, al, ol, er, or, ent, ant, ible,” and “able." Another interesting feature is a lesson on computer-related terms, updated in 2011.