anchor.diff:  5.6,2.5,3.9,1.1,Iris-versicolor
   5.9,3.2,4.8,1.8,Iris-versicolor
   6.1,2.8,4.0,1.3,Iris-versicolor
  -6.3,2.5,4.9,1.5,Iris-versicolor
  +6.3,NA,4.9,1.5,Iris-versicolor
   6.1,2.8,4.7,1.2,Iris-versicolor
   6.4,2.9,4.3,1.3,Iris-versicolor
   6.6,3.0,4.4,1.4,Iris-versicolor
  
positive.code: 4.6,3.2,1.4,0.2,Iris-setosa
  5.3,3.7,1.5,0.2,Iris-setosa
  5.0,3.3,1.4,0.2,Iris-setosa
  7.0,3.2,4.7,1.4,Iris-versicolor
  6.4,3.2,4.5,1.5,Iris-versicolor
  6.9,3.1,4.9,1.5,Iris-versicolor
  5.5,2.3,4.0,1.3,Iris-versicolor
  
negative.code: 6.0,3.4,4.5,1.6,Iris-versicolor
  6.7,3.1,4.7,1.5,Iris-versicolor
  6.3,2.3,4.4,1.3,Iris-versicolor
  5.6,NA,4.1,1.3,Iris-versicolor
  5.5,2.5,4.0,1.3,Iris-versicolor
  5.5,2.6,4.4,1.2,Iris-versicolor
  6.1,3.0,4.6,1.4,Iris-versicolor
  