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I solved part 2 by using 2 maps: one to track pair counts, and one to track element counts.
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Here is my Java Solution : [AoC, year 2021, Day 14](https://github.com/welguisz/advent-of-code/blob/master/src/com/dwelguisz/year2021/AdventDay14.java). The counting part of the solution starts on Line 83.
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Or you can just add only one letter from each pair and hence avoid the double counting.
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