principle is applied principle is based principle is called principle is described principle is illustrated principle is known principle is shown principle is similar principle is simple principle is the same principle is true principle is used principle known principle makes principle may principle must be applied principle not principle number principle of action principle of additionality principle of annuality principle of autonomy principle of availability principle of causality principle of community principle of comparative principle of complementarity principle of confidentiality principle of consensus principle of conservation principle of continuity principle of cooperation principle of data principle of democracy principle of democratic principle of double principle of economic principle of equal principle of equal pay principle of equal treatment principle of equality principle of equity principle of equivalence principle of fair principle of fairness principle of free principle of free movement principle of freedom principle of gender principle of good principle of good faith principle of human principle of humanity principle of independence principle of individual principle of international principle of international law principle of justice principle of law principle of legal certainty principle of legality principle of life principle of maximum principle of mutual principle of mutual recognition principle of national principle of natural principle of neutrality principle of non principle of non-discrimination principle of non-interference principle of non-refoulement principle of nondiscrimination principle of operation principle of partnership principle of population principle of proportionality principle of public principle of reciprocity principle of relative principle of relativity principle of respect principle of self-determination principle of separation principle of separation of powers principle of shared principle of social principle of solidarity principle of sovereignty principle of subsidiarity principle of sufficient reason principle of superposition principle of sustainability principle of territorial principle of territoriality principle of the invention principle of the method principle of the separation principle of the thing