Consider the following sets:
R = {x | x is the set of rectangles}
P = {x | x is the set of parallelograms}
T = {x|x is the set of triangles}
1 = {x | x is the set of isosceles triangles}
E = {x|x is the set of equilateral triangles}
S = {x | x is the set of scalene triangles}