[Year 12 Its] Post mortem erratum - B7a

[Mark Kelly]

In B7a, my original answer to the second test case was "Close" based on 
the action of the first IF statement. Thanks to a perceptive student who 
emailed to correct: it should be (close, then) *Open*.

The t=34 triggers the first IF statement (which closes the curtain). It 
was at that point that I stopped reading and moved to the next question...

But then in the second IF statement the L=5000 triggers the curtain 
opening. So the curtain closes, then opens, so the algorithm finally 
produces an OPEN status - which is what the question asked. Ooops!

-- 
Mark Kelly
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