mk_example: book example for the single item lot sizing

def mk_example():
    """mk_example: book example for the single item lot sizing"""
    T = 5
    _,f,c,d,h = multidict({
        1 :  [3,1,5,1],
        2 :  [3,1,7,1],
        3 :  [3,3,3,1],
        4 :  [3,3,6,1],
        5 :  [3,3,4,1],
        })

    return T,f,c,d,h