Additional properties are not allowed ('collapsed' was unexpected) Failed validating 'additionalProperties' in markdown_cell: On instance['cells'][0]: {'cell_type': 'markdown', 'collapsed': False, 'id': 'e21a06f3', 'metadata': {}, 'source': '<table><tr><td>\n' '<img width="300" src="http://calicoproject.org/w...'}
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