Design the decimal prime number circuit of Exercise 6.6 in product of-sums form.

Data in Exercise 6.6 

Design a circuit whose output is true if its four-bit decimal input is really a prime number – not including “1” – that is, the output is true if the input is 2, 3, 5 or 7. The output is an X (don’t care) for input combinations 10–15. Go through the same steps as in Exercise 6.2.