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It's not so easy

Luckily our students didn't have to go through the trauma of doing this since they do all their answers on the exam paper but if you have been invigilating or sitting other exams you might have come across this little teaser. Looks easy but it isn't.I wonder how many booklets were wasted worldwide due to wobbly lines. Another IB oddity I noticed was that all the exam paper envelopes have a the "open here" line at the bottom. Who opens envelopes at the bottom?

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