Fix issue in counting number of excluded pairs in RDF.

[chrisjonesBSU]

Bug fix that fixes issue that was causing over-counting of the number of excluded pairs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.30%. Comparing base (663fd30) to head (9067d11).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #152      +/-   ##
==========================================
+ Coverage   96.29%   96.30%   +0.01%     
==========================================
  Files           8        8              
  Lines         810      813       +3     
==========================================
+ Hits          780      783       +3     
  Misses         30       30              

Files with missing lines	Coverage Δ
cmeutils/structure.py	99.56% <100.00%> (+<0.01%)	⬆️

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