Cipher

Crack the Code!

While the spaces have been removed from this question, here are two hints. First, the plaintext is an article from Wikipedia, about Helium. The second hint is that the first word is "Helium."

Good luck!

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Frequency of cipher

Frequency of English

A joint project of Prof. Seth Dutter and Prof. Gregory Bard of the University of Wisconsin---Stout, Department of Mathematics, Statistics, and Computer Science. (October 31, 2013)