By Lewis Krauskopf NEW YORK (Reuters) -Earnings reports next week, including from Tesla and Netflix, will provide a deeper look at U.S. corporate profits while delayed U.S. inflation data will mark another test of the stock market, which has become shakier even as it remains around record highs. The fourth year of the S&P 500's bull run kicked off this week with some significant gyrations after a long period of market calm. Revived U.S.-China trade tensions and credit concerns at regional U.S. banks drove the anxiety. The CBOE market volatility index, known as Wall Street's "fear gauge", has surged in recent days and hit its highest level in nearly six months on Friday. "The market is becoming more volatile, but it's also coming off of a very non-volatile period where we didn't have a lot

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