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美装をこらして.
正多面体.
正多角形.
a metallic element with an atomic number of 4, called beryllium
an element whose valence is expressed by an even number, called
the antiparticle of a baryon
a constituent of the nucleon, called {parton}
the law that states that the properties of chemical elements vary at regular intervals when the elements are arranged in the order of their atomic number
the arrangement of people in a line for marching