what recipe requires at most 5.0 to make and uses 8.0 of the ingredient?
(AND food.recipe (AND (JOIN (R food.recipe_ingredient.recipe) (JOIN food.recipe_ingredient.quantity 8.0^^http://www.w3.org/2001/XMLSchema#float)) (le food.recipe.preparation_time 5.0^^http://www.w3.org/2001/XMLSchema#float)))