//        This listing demonstrates that spaces can be
//        freely used when writing a program in SiMPLE.


          D o
             D o   k = 4 0 0 , 1 0 0 0 , 5
                s o u n d   ( k )
                w a i t   q u i t   k e y   ( - 1 ,   3 )
             L o o p   k
             D o   k = 1 0 0 0 , 4 0 0 , - 3
                s o u n d   ( k )
                w a i t   q u i t   k e y   ( - 1 ,   6 )
             L o o p   k
          L o o p