Rhubarb Crumb Pie
["1 (9 or 10-inch) pie shell (unbaked)", "4 c. rhubarb, chopped", "1 egg, slightly beaten", "1 tsp. vanilla", "4 Tbsp. flour", "1 c. sugar", "3/4 c. flour", "1/2 c. brown sugar", "1/3 c. margarine"]
["Preheat oven to 375\u00b0.", "Combine rhubarb, egg, vanilla, 4 tablespoons flour and sugar together.", "Pour into unbaked pie shell.", "Blend 3/4 cup flour, brown sugar and margarine together until crumbly.", "Sprinkle over rhubarb mixture.", "Bake for 40 to 45 minutes at 375\u00b0."]
["pie shell", "rhubarb", "egg", "vanilla", "flour", "sugar", "flour", "brown sugar", "margarine"]