can you explain the following cplex code :
execute INITIALIZE {

}  
//SETS
int nbIngredients = ...;                        //number of ingredients (11)
int nbSuppliers = ...;                          //number of suppliers (3)
range Ingredients = 1..nbIngredients;       
range Suppliers = 1..nbSuppliers;
float Prices[Suppliers][Ingredients] = ...;
float Delivery[Suppliers] = ...;                //delivery prices
int Demand[Ingredients] = ...;                  //the number of the ingredients to order
int p = ...;

//VARIABLES
dvar int+ x[Suppliers][Ingredients];
dvar boolean y[Ingredients];

//OBJECTIVE FUNCTION
minimize sum(i in Suppliers) (sum(j in Ingredients) Prices[i][j]*Demand[j] + Delivery[i]*y[i]);

//CONSTRAINTS
subject to {
        sum(i in Suppliers) y[i] <= p;
        
        forall (j in Ingredients)
            sum(i in Suppliers) x[i][j] == Demand[j];
        
}

execute {
  
""