STATS, UNIQUE and VERIFY
ON operand: You can use symbols where you can use fields (p,m,f and p,m). A symbol for p,m,f results in substitution of p,m if symbol,f is specified.
ON operand: You can use symbols where you can use fields (p,m,f and p,m). A symbol for p,m,f results in substitution of p,m if symbol,f is specified.