An **addition chain** is a sequence of integers starting from 1, where each subsequent number is obtained by adding any two previous numbers in the sequence. The goal of an addition chain is to reach a specific target number using the fewest possible additions. For example, an addition chain for the number 15 could be: 1. Start with 1. 2. Add 1 + 1 to get 2. 3. Add 1 + 2 to get 3.
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