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are carbon 12 and carbon 14 isotopes
carbon 12 13 14 isotopes
isotopes of carbon 12
isotopes of carbon 14
is carbon 12 an isotope
is carbon 14 an isotope
carbon has two isotopes c-12 and c-14
what is carbon 12 isotope
three isotopes of carbon 14
why is carbon 12 an isotope
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