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'''"Unfolding" design.''' The exercises are designed to be done in your head, without writing. On purpose, each unfolds in stages: first, the problem text, then one or two hints, then a solution, and an explanation. You'll get the most out of the exercises by thinking carefully about each stage before clicking on the next one. Expect to stop when you've had enough, and plan to return to take up where you left off. We suggest you work through the exercises in a "distributed" (spaced out) way, not "massed" (all at once). Try clumps of five or six at time, then a good break. This is likely to have a more powerful effect on your learning (see ''Scientific American'', March 2012, p. 12).
'''Variety of English.''' The page uses UK/Australian/Irish/New Zealand/South African spelling. Shouldn't be a problem. American readers just need to "translate" -ise → -ize, -our → -or, -lling → -ling, and the few other differences. Canadians, well, you're somewhere in the middle.
Feedback on how to improve the exercises is welcome on the talk page.▼
▲'''Feedback.'''
'''Instructions:''' click on <font color=darkblue>[Show]</font> to the right of each stage. Good luck!
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