Trace
# define Trace(x) {if (z_verbose>=0) fprintf x ;}
# define Trace(x)
# define Trace(x) fprintf x
# define Trace(x)
# define Trace(x) {if (z_verbose>=0) fprintf x ;}
# define Trace(x)
# define Trace(x) {if (z_verbose>=0) fprintf x ;}
# define Trace(x)