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Gray
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Stirling formula
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Ecliptic plane
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Coprolalia
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Fauna
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Vibrissa
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Anti-g suit
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Microfiltration
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Cardiovascular system
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Fumaroles
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Port
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Instrumental aberration
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World Charter for Nature
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Anthrax bacillus
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Hamilton equations
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Poison ivy
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Permian
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IEC
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Progestogen pill
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Europa
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Absolute magnitude
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I.Q.
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Arginine
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Windows Vista
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Methylergometrine
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Psycho-oncologist
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Echocardiography
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Magnetoresistance
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Speleology
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Higgs boson
Class
A class is a group that shares common traits. Birds form a class in the phylum of vertebrates. A class includes one or several orders.
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