Implement notation sequences

[scottbedard]

closes #4

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 94.69%. Comparing base (2440926) to head (5200dbc).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/lib.rs	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #8      +/-   ##
==========================================
- Coverage   94.99%   94.69%   -0.30%     
==========================================
  Files          17       17              
  Lines        2296     2320      +24     
==========================================
+ Hits         2181     2197      +16     
- Misses        115      123       +8     

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