In each of the following cases, fill `sub or sub` in the blank space to make a correct statement:
{x:x is a rhombus in the plane `pi}….{x:x is a square in the plane pi`}`

Make correct statements by filling in the symbols sub or cancel sub in the blank spaces : {x : x is a triangle in a plane) . . . {x : x is a rectangle in the plane)

Make correct statements by filling in the symbols sub or cancel sub in the blank spaces : {x : x is a circle in the plane) . . .{x : x is a circle in the same plane with radius 1 unit)

Make correct statements by filling in the symbols sub or cancel sub in the blank spaces : {x : x is an equilateral triangle in a plane) ... {x : x is a triangle in the same plane)

Fill in the blanks to make each of the following a true statement: 37 x 18 = 37 x 9 + 37 ...

Make correct statements by filling in the symbols sub or cancel sub in the blank spaces : {x : x is an even natural number) ... {x : x is an integer)

Fill in the blanks to make each of the following a true statement: 0 xx 13434 = ............

Make correct statements by filling in the symbols sub or cancel sub in the blank spaces : { a, b, c } . . . { b, c, d }

Fill in the blanks to make each of the following a true statement: 1000 xx 100 = ..............

Fill in the blanks to make each of the following a true statement: 19 xx 0 = ...................

Fill in the blanks to make each of the following a true statement: 22 xx 45 = 22 xx 50 - 22 xx .........