Add SearchFirst macro for weka classifier

[imagejan]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.18%. Comparing base (7ff3b33) to head (15c2ca2).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #73   +/-   ##
=======================================
  Coverage   98.18%   98.18%           
=======================================
  Files           8        8           
  Lines         386      386           
  Branches       29       29           
=======================================
  Hits          379      379           
  Misses          3        3           
  Partials        4        4           

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