requestedVariables.putAll(parent.getVariableInstances(variableNamesToFetch, fetchAllVariables));
requestedVariables.putAll(parent.getVariableInstances(variableNamesToFetch, fetchAllVariables));
requestedVariables.putAll(parent.getVariableInstances(variableNamesToFetch, fetchAllVariables));
requestedVariables.putAll(parent.getVariableInstances(variableNamesToFetch, fetchAllVariables));