isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad isolation is not always bad