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The task is to check if there is an "s" field in the JSON, I've tried to do this as follows: ⍝ Example JSON I'm working with JSON ← '{"e":"depthUpdate","E":1699599166770,"s":"BTCUSDT","U":40239636237,"u":40239636314,"b":[["36651.78000000","9.81839000"],["36584.34000000","0.00000000"],["3654...