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Describe the oscillators and basic wave forms -- sine, triangle, square, and sawtooth.

What is the question?We make ____ oscillators from only odd-numbered harmonics, and ____ from all harmonics.
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OK	Value	Feedback
	Square, rectangle, and sawtooth; Triangle	Triangle is a gentle simple wave.
	Triangle, square, and rectangle; Sawtooth	Yes!
	Triangle and sawtooth; Square and rectangle	Square waves only use odd-numbered harmonics.
	Triangle and square; Sawtooth and rectangle	Rectangle waves, while have a duty cycle, do not use all harmonics.

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