CREATE TABLE table_41574 ("Week of" TEXT, "Tier" TEXT, "Winner" TEXT, "Runner-up" TEXT, "Semi finalists" TEXT)

What is Week, when Semi Finalists is Sandrine Testud Yone Kamio?
SELECT "Week of" FROM table_41574 WHERE "Semi finalists" = 'sandrine testud yone kamio'
SELECT "Week of" FROM "table_41574" WHERE "Semi finalists" = 'sandrine testud yone kamio'