Try replacing the + with a more complicated expression. ((if t + -) 1 2 3) and (if t + -) (1 2 3). In your notation it is much harder to determine which express

Try replacing the + with a more complicated expression. ((if t + -) 1 2 3) and (if t + -) (1 2 3). In your notation it is much harder to determine which expressions are intended to be evaluated.