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Printing Commands
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`p'
     Prints the value on the top of the stack, without altering the
     stack.  A newline is printed after the value.

`P'
     Prints the value on the top of the stack, popping it off, and does
     not print a newline after.

`f'
     Prints the entire contents of the stack without altering anything.
     This is a good command to use if you are lost or want to figure
     out what the effect of some command has been.