CREATE TABLE table_68378 ("2005" CLOB, "2006" CLOB, "2007" CLOB, "2008" CLOB, "2009" CLOB, "2010" CLOB)

Who attended the school in 2006, that Whitney Powell attended in 2007?
SELECT "2006" FROM table_68378 WHERE "2007" = 'whitney powell'
SELECT "2006" FROM "table_68378" WHERE "2007" = 'whitney powell'