/* ---------------------------------- */
/* save as fb.h                   */
/* --------------------------------- */
double M(
double x,
double y,
double z)
{
      return( (2*x*z) );
}
char  Meq[] = "+ 2*x*z";
/* --------------------------------- */
double N(
double x,
double y,
double z)
{
      return( (x*y*z) );
}
char  Neq[] = "+ x*y*z";
/* --------------------------------- */
double P(
double x,
double y,
double z)
{
      return( (y*z) );
}
char  Peq[] = " + y*z";
/* --------------------------------- */
double u(
double x,
double y)
{
 return(      (0));
}
char  ueq[] = "0";
/* --------------------------------- */
double v(
double x,
double y)
{
 return(       ((4-x)/2) );
}
char  veq[] = "(4-x)/2";
/* --------------------------------- */
double s(
double y)
{
 return(       0 );
}
char  seq[] = "0";
/* --------------------------------- */
double t(
double y)
{
 return(       4  );
}
char  teq[] = "4";
/* --------------------------------- */
/* --------------------------------- */