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airborne collision avoidance (system) Bessel's differential equation Camellia chungkingensis extra small bearing Grand Erg Occidental hootin' tootin' Huygens' principle of superposition knot-hole maarianhamina (mariehamn) micro turbulence micro-switch outlet of ventilating system ovigenous ovarian tumor peripheral vascular disorder roof bolting with barand wire mesh smallest particles stalked supraclavicular points visiting card westphal