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principal axis of compliance principal moment of inertia principal radius of curvature principal invariant of tensor transformation of principal axis principal direction of curvature principal of a loan separation of principal part principal axis of inertia principal axis of quadric ratio of principal stresses safety of income-principal principal axes of stress principal value of power principal value of argument repayment of principal mind of principal criminal principal plane of bending principal value of radical principal direction of glide principal plane of flexure