use SymmetrySectors.nsymbol

[ogauthe]

closes #14

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.03%. Comparing base (54daa02) to head (5ca3b51).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
- Coverage   90.13%   90.03%   -0.10%     
==========================================
  Files          10       10              
  Lines         537      532       -5     
==========================================
- Hits          484      479       -5     
  Misses         53       53              

Flag	Coverage Δ
docs	0.00% <ø> (ø)

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