• cons creates a list from the first element of that list and the list of remaining elements.
• list creates a list from the elements of the list itself
• append creates a list from two lists, the elements of which are concatenated to give the new list

Examples:

• cons(1, [2, 3, 4]) ==> [1, 2, 3, 4]
• list(1, 2, 3, 4) ==> [1, 2, 3, 4]
• append([1, 2], [3, 4]) ==> [1, 2, 3, 4]