B = the set of even prime numbers less than 5

C = {students in your class more than 30 years old}

D = {mammal that lay eggs}

E = {the city in east java which is passed by Bengawan Solo river}

F = {whole number less or equal than 0}

G = {natural number less than 1}

H = the set of prime numbers divisible by 3

I = the set of prime numbers divisible by 4

J = the set of odd numbers greater than 1,000,000,000

K = the set of quadratics numbers between 25 and 36

L = the set of stars in the sky

M = the set of fractions between 0 and 1

N = the set of sands at the beach

O = the set of negative number which can be squared into 25