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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.
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