'execution_count' is a required property Failed validating 'required' in execute_result: On instance['cells'][5]['outputs'][1]: {'data': {'text/html': '<img ' 'src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAoAAAAHg...', 'text/plain': '<IPython.core.display.HTML object>'}, 'metadata': {}, 'output_type': 'execute_result'}
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