Put four things on the stack, two integers and two words.
3, "cat", 99, "blue";The assignment arrow can be used to remove the top of the stack and store it as the value of x.
-> x;Now print out what is left on the stack.
=>
** 3 cat 99
I.e. only three things left. What was the fourth is now the value of x:
x =>
** blue
(The non-destructive assignment arrow "->>" described later, assigns the
top of the stack without removing it.)