Non-primes: each has 3 choices → $ 3 \times 3 = 9 $, but we must restrict to even non-primes? No: for sum parity, only the oddness matters.

Non-primes: each has 3 choices → $ 3 \times 3 = 9 $, but we must restrict to even non-primes? No: for sum parity, only the oddness matters.

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