In his first year at university, Mattia had learned that, among prime numbers, there are some that are even more special. Mathematicians call them twin primes: pairs of prime numbers that are close to each other, almost neighbors, but between them there is always an even number that prevents them from truly touching.

Mattia thought that he and Alice were like that, twin primes, alone and lost, close but not really close enough to touch each other.

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