1. "... if I had known that" is better, and the comma is probably not needed.
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GPY1. "... if I had known that" is better, and the comma is probably not needed. What are you intending to express by using "slept in" rather than just "slept"?I thought to 'sleep in' means to sleep later than the usual time.
GPY2. I would understand "market close" to refer to the end-of-day closure of a stock market (or financia