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From: R. Nachmani
Subject: Three-valued logic
Date: 17 Kislev 5784
Of course it is different.
-S3 means: I checked for three stars and they were not visible. Perhaps it is cloudy, perhaps too early.
No mention of S3 means: I did not check. Or I checked and did not think it relevant to record. Or I forgot.
The first tells you something. The second tells you nothing.
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