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There are even some errors in the in-game descriptions (for example, Master Combat description says that it is required for Grandmaster Melee, when it is clearly not).
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The manual describes some skills incorrectly. Each skill, primary or secondary, has five levels of mastery. Once the primary skill is learned, you will be able to learn all of its associated secondary skills. To learn the secondary skills, their parent primary skill must be learned first. Each primary skill has three associated secondary skills. There are 9 primary skills in Heroes of Might and Magic IV - 4 Might and 5 Magic primary skills.
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