For 13 to be unlucky would require there to be some kind of cosmic intelligence that counts things that humans count and that also makes certain things happen on certain dates or in certain places according to whether the number 13 'is involved' or not (whatever 'is involved' might mean).

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I was no chief and never had been but because I had been more deeply wronged than others this honor was conferred upon me and I resolved to prove worthy of the trust.