A television programmer is arranging the order that seven movies will be seen between the hours of 6 P. M. and 8 A. M. One of the movies has a G rating, and it is to be shown in the first time block. One of the movies is rated NC-17, and it is to be shown in the last of the time blocks, from 6 A. M. until 8 A. M. Given these restrictions, in how many ways can the seven movies be arranged during the indicated time blocks?