add 3 examples

[houpc]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.36%. Comparing base (55db846) to head (1cca1bd).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #34   +/-   ##
=======================================
  Coverage   95.36%   95.36%           
=======================================
  Files          10       10           
  Lines        1359     1359           
=======================================
  Hits         1296     1296           
  Misses         63       63           

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