Final NR is 2000
a=wye,b=cat,i=2000,x=0.10887569736363611,y=0.3480524315645718,x2=0.01185391747641808,xy=0.037894451205701986,y2=0.12114049511801092
a=hat,b=dog,i=1999,x=0.010819574860139292,y=0.8983779455002124,x2=0.00011706320015415817,xy=0.009720067434037685,y2=0.8070829329611827
