PS. Going through DAS allowed me to understand my students'
situation better. I used to get upset when my students couldn't
master basic things like the definition of continuity. But having
failed the U-turn on my first two test I became less critical. In
every subject there are things that appear to be simple to the
people who teach them but are hard for the students.
PPS. Still, I would say that doing a U-turn is harder than learning
the definition of continuity.
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