[NTG-context] How to \processcommalist inside another commalist?

Hello, I tried to print out primes (well, I tried to do something else, but I needed a more illustrative example), but it seems that my approach was too naive: \def\arePrime[#1]{% \bgroup \getparameters[Prime][p=,#1] \def\printPrime##1{##1 is prime.\crlf} \processcommalist[\Primep]\printPrime \egroup} \starttext \arePrime[p={2,3,5}] \stoptext I expected something like 2 is prime. 3 is prime. 5 is prime. But I got 2,3,5 is prime. Any suggestions or hints about how to change the macro to produce the desired result (using the same input)? Thank you a lot, Mojca