The half-elf gets a racial power that lets him take an at-will from a class not his own and make it an encounter power. Does that mean it replaces his class encounter power or that he gets an additional encounter power?
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You seem to be talking about the Dilettante. this does not replace anything. It is a bonus Racial power. The first Player's Handbook has the details on page 42 as does Player Essentials: Heroes of the Forgotten Kingdoms on page 252.
If it replaced something the text would say it.