(i) {2, 3, 4}…{1, 2, 3, 4, 5}
(ii) {a, b, c}…{b, c, d}
(iii) {x : x is a student of Class XI of your school}. . .{x : x student of your school}
(iv) {x : x is a circle in the plane }…{x : x is a circle in the same plane with radius 1 unit }
(v) {x : x is a triangle in a plane } … {x : x is a rectangle in the plane }
(vi) {x : x is an equilateral triangle in a plane} . . . {x : x is a triangle in the same plane}
(vii) {x : x is an even natural number } … {x : x is an integer }