list(list("x=1","y=2"),
     list("x=root_of(x_**6 + x_ + 1,x_,tag_1)","x=1"),
     list(list("a+b","b+c","c+d",list("xyz"," def")), list("a+b","b+c",list("xyz"," def"),"c+d")),
     list(list("a+b","b+c","c+d",list("xyz"," def")),list("a+b","b+c",list("xyz"," def"),"c+d")),
     list(list("x=2.12","y=0","z=-2.12"),
          list("x=-2.12","y=0","z=2.12"),
          list("x=0","y=2.12","z=-2.12"),
          list("x=0","y=-2.12","z=2.12")),
     list(list("x=(2*sqrt( - sqrt(37) - 7)*sqrt(3) + sqrt(74) + sqrt(2))/(4*sqrt(2))",
               "y=( - 2*sqrt( - sqrt(37) - 7)*sqrt(3) + sqrt(74) + sqrt(2))/(4*sqrt(2))",
               "z=( - (sqrt(37) + 1))/2"),
          list("x=( - 2*sqrt( - sqrt(37) - 7)*sqrt(3) + sqrt(74) + sqrt(2))/(4*sqrt(2))",
               "y=(2*sqrt( - sqrt(37) - 7)*sqrt(3) + sqrt(74) + sqrt(2))/(4*sqrt(2))",
               "z=( - (sqrt(37) + 1))/2"),
          list("x=(2*sqrt(sqrt(37) - 7)*sqrt(3) - sqrt(74) + sqrt(2))/(4*sqrt(2))",
               "y=( - 2*sqrt(sqrt(37) - 7)*sqrt(3) - sqrt(74) + sqrt(2))/(4*sqrt(2))",
               "z=(sqrt(37) - 1)/2"),
          list("x=( - 2*sqrt(sqrt(37) - 7)*sqrt(3) - sqrt(74) + sqrt(2))/(4*sqrt(2))",
               "y=(2*sqrt(sqrt(37) - 7)*sqrt(3) - sqrt(74) + sqrt(2))/(4*sqrt(2))",
               "z=(sqrt(37) - 1)/2")),
     list(list("x= - y","y=root_of(y_**4 + y_ - 1,y_,tag_3)"),
          list("x= - y","y=root_of(y_**3 + y_**2 - 1,y_,tag_2)")))
