The Purple Level Books (fifth level) use only decodable regular words based on previously taught letter-sound knowledge, including:
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42 main letter sounds and key alternative spellings:
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ay as in day, ea as in seat
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igh as in high, ow as in low, ew as in dew
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oy, ir, ur, al, aw, au, ph, air, ear, are
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Rules like “If the short vowel doesn’t work, try the long vowel”
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Faint type used for silent letters (e.g., the b in lamb)
Each book also includes: