EXPLODE
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In this case, exploding Heart Diseases will include articles that are indexed to the generic term heart diseases, AND all of the specific kinds of heart diseases -- arrythmia, carcinoid
heart disease, cardiac tamponade, cardiomegaly, endocarditis,
and the rest of the terms in the heart
diseases tree.
You do not need to explode every term in the tree. Instead, just explode the main term -- heart diseases.
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