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Thursday, July 25, 2013
Radium
Barium
Strontium
Calcium
Francium
Cesium
Rubidium
Potassium
Sodium
Lithium
Ununseptium
Ununoctium
Radon
Xenon
Krypton
Argon
Neon
Helium
Astatine
Iodine
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