Palindrome Products: refine the problem (#1662)
Palindrome Products: refine the problem (#1662)

For me it took a while to understand that we calculate product of exactly two numbers. BTW in the [original problem](https://projecteuler.net/problem=4) it is stated clearly.
exercism/x-common,petertseng/x-common,jmluy/x-common,jmluy/x-common,petertseng/x-common,exercism/x-common,jmluy/x-common