Bugfix/merge duplicates

[RobertoRoos]

Resolves #57

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.71%. Comparing base (4bd8e43) to head (82ecc4b).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
+ Coverage   87.59%   87.71%   +0.12%     
==========================================
  Files          15       15              
  Lines        1193     1205      +12     
  Branches      206      208       +2     
==========================================
+ Hits         1045     1057      +12     
  Misses        105      105              
  Partials       43       43              

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