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% Version: CMPL 1.1
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% The Original Code is  The ECLiPSe Constraint Logic Programming System. 
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:- lib(ech).

:- option(already_in_store, off).

:- constraints prime/1, primes/1.

primes(1) <=> true.
primes(N) <=> N > 1 | M is N - 1, prime(N), primes(M).

prime(I) \ prime(J) <=> J mod I =:= 0 | true.