principal shepherd principal skinner principal snyder principal source principal sources principal sponsor principal stages principal state principal steps principal strategic principal subject principal subjects principal subsidiary principal sum principal supplier principal target principal task principal tasks principal teacher principal theme principal themes principal today principal told principal tool principal town principal towns principal trade principal trading principal turner principal types principal use principal users principal value principal victims principal victoria principal wants principal way principal ways principal weatherbee principal who principal will principal wilson principal witness principal work principal works principales principalities principalities and powers principality principality has principality of andorra principality of antioch principality of asturias principality of bulgaria principality of liechtenstein principality of monaco principality of serbia principality of transylvania principality stadium principally principally concerned principally due principally responsible principally used principals principals and teachers principals have principate principe príncipe principe de príncipe de principe di principe real príncipe real principes principessa principi principia mathematica principio principle principle according principle allows principle alone principle also principle and practice principle applies principle at work principle based principle called principle can also principle can be applied principle can be used principle comes principle consists principle diagram principle does not principle does not apply principle investigator