level of details level of development level of difficulty level of digital level of disability level of discomfort level of discretion level of discussion level of diversity level of domestic level of earnings level of economic level of economic activity level of economic development level of education level of educational attainment level of effectiveness level of efficiency level of effort level of emissions level of emotional level of empathy level of employee level of employment level of encryption level of energy level of engagement level of english level of enthusiasm level of environmental level of equipment level of error level of estrogen level of evidence level of excellence level of excitement level of exercise level of existence level of expectation level of expenditure level of experience level of expertise level of exposure level of expression level of external level of fame level of fat level of fatigue level of fear level of female level of financial level of financing level of fines level of fitness level of flexibility level of focus level of food level of football level of force level of foreign level of formality level of free level of freedom level of french level of frustration level of fuel level of function level of functional level of functionality level of functioning level of funding level of general level of german level of global level of glucose level of governance level of government level of granularity level of growth level of happiness level of harmonisation level of health level of health protection level of heat level of hell level of high level of higher level of household level of human level of humidity level of hydration level of hygiene level of ice level of ignorance level of immigration level of impact level of implementation level of importance level of imports