[CellCheckFailure(reason='whitespace in the middle', contents='for\nyou', row=1, column=0), CellCheckFailure(reason='whitespace in the middle', contents='and\rfun', row=1, column=1), CellCheckFailure(reason='leading whitespace', contents=' leading', row=2, column=0), CellCheckFailure(reason='trailing whitespace', contents='trailing ', row=2, column=1)]