principal witness principal wood principal work principal's car principal's daughter principal's house principal's office principal's son principales principale principalities principality of andorra principality of asturias principality of bulgaria principality of catalonia principality of moldavia principality of monaco principality of orange principality of transylvania principality stadium principality principally concerned principally engaged principally used principally principals of islam principals principal principate principe amedeo principe de principe pio principessa principes principe principia mathematica principia principio principium principi principle aim principle allows principle applies principle can principle diagram principle implies principle in favour principle in relation principle is accepted principle is based principle is enshrined principle is similar principle is simple principle may principle means principle must be applied principle must principle of access principle of action principle of additionality principle of amendment principle of an open market economy principle of annuality principle of availability principle of balance principle of beneficence principle of burden-sharing principle of causality principle of citizenship principle of co-financing principle of cofinancing principle of cohesion principle of collective responsibility principle of collegiality principle of community preference principle of compensation principle of concentration principle of conditionality principle of conferral principle of confidentiality principle of consistency principle of continuity principle of creation principle of decentralisation principle of differentiation principle of effectiveness principle of equal opportunities principle of equal pay principle of equal rights principle of equal treatment to the principle of equal treatment principle of equality of opportunity principle of equality of treatment to the principle of equality principle of equality principle of equilibrium principle of equity principle of equivalence principle of european solidarity principle of evolution principle of extraterritoriality principle of fiscal neutrality principle of flexibility principle of free movement principle of freedom of access principle of freedom of choice principle of freedom of contract principle of freedom of establishment principle of freedom of expression principle of freedom of movement principle of freedom principle of gender equality principle of gender mainstreaming principle of good faith principle of including principle of independence principle of integration principle of least action principle of legal certainty principle of legality principle of liability principle of life principle of love principle of mainstreaming principle of minimum harmonisation principle of mutual recognition principle of mutual trust principle of national responsibility principle of national treatment principle of nationality to the principle of neutrality principle of neutrality principle of ne principle of non discrimination to the principle of non-discrimination principle of non-discrimination principle of non-refoulement principle of non-violence to the principle of nondiscrimination principle of nondiscrimination principle of operation principle of parity principle of participation principle of partnership principle of precaution principle of prevention principle of proportionality to the principle of proportionality principle of providing principle of proximity principle of prudence principle of public access principle of reciprocity principle of relative stability principle of relativity principle of religious freedom principle of respect principle of responsibility principle of secularism principle of security principle of separation principle of shared responsibility principle of solidarity must to the principle of solidarity principle of solidarity principle of sound administration principle of subsidiarity to the principle of subsidiarity principle of sufficient reason to the principle of sustainability principle of sustainability principle of sustainable development principle of technological neutrality principle of territorial cohesion principle of territoriality principle of the free movement of goods principle of the method principle of the presumption of innocence principle of the protection of legitimate expectations principle of the rule of law to the principle of transparency principle of transparency principle of unanimity principle of unity principle of using principle of work principle of zero tolerance principle remains principle requires principle seems principle should apply principle should be applied principle should principle that member states principle was established principle was introduced principle-based principled approach principled man principled opposition