Give the product and its stereochemistry when each of the following alcohols is subjected to asymmetric epoxidation with tert-butyl hydroperoxide, Ti(OiPr)₄, and the stereoisomer of diethyl tartrate (DET) indicated.

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Ph OH, (-)-DET (b) H H₂C =C CH₂OH CH3 3 (+)-DET O OH 3 (-)-DET