add some canonical forms

[baggepinnen]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 98.52941% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.70%. Comparing base (9909007) to head (e4eefce).
⚠️ Report is 392 commits behind head on master.

Files with missing lines	Patch %	Lines
src/canonical.jl	98.52%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
+ Coverage   89.44%   89.70%   +0.26%     
==========================================
  Files          16       17       +1     
  Lines        2283     2351      +68     
==========================================
+ Hits         2042     2109      +67     
- Misses        241      242       +1     

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