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is 20 a prime number
is 20 a prime number or a composite number
is 20 a prime number or composite
prime numbers between 10 and 20
prime numbers to 20
prime numbers between 20 and 30
all prime numbers between 10 and 20
prime numbers less than 20
prime numbers 1 to 20
prime numbers between 20 and 40
is 20 a prime number, is 20 a prime number or a composite number, is 20 a prime number or composite, prime numbers between 10 and 20, prime numbers to 20, prime numbers between 20 and 30, all prime numbers between 10 and 20, prime numbers less than 20, prime numbers 1 to 20, prime numbers between 20 and 40
