/*

Typically a French menu consists of
	- Appetizer
	- Main course (meat, fish or vegetarian)
	- Dessert 

Examples of appetizers
	salad, poached egg, artichoke

Examples of main courses
	meat: steak with vegetables, chicken with fries, 
	fish: trout with rice, salmon with eggplant
	vegetarian: falafel with rice, vegetable lasagna

Examples of desserts
	fruit salad, fresh fruit, cake

Write a Prolog program
	Facts to introduce components
	Rule(s) to define/verify the structure of a French menu

A valid menu
?- french_menu(salad, trout_with_rice, cake).

Invalid menus
?- french_menu(salad, trout, cake).
?- french_menu(falafel_with_rice, trout_with_rice, cake).

*/