WAIT - pause for a specified length of time.
- $*$WAIT expression :string
- evaluates "expression" to get an integer "n".
It then outputs "string", and pauses for "n" seconds.
If "n" is negative, EXEC does not pause.
EXEC does not write a new-line after outputting "string".
This means that you can use $*$WAIT to prompt for input and
obtain the input on the same line as the prompt.
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