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=== Default values ===
* 'set' called with 'bob' without a value. Variable 'bob' doesn't exist.
<kua>
> set bob
Unknown: bob
</kua>
* Creates variable 'bob' and sets to 'fred'.
> set bob fred
* Same as the first example, but now bob exists.
> var bob
'bob' is 'fred'
* Try to set existing 'bob' to 'james', value changes.
> var bob james
'bob' is 'james'