1) unit rate 2) ratio 3) multiplicative relationship (versus additive) 4) additive relationship 5) part-to-part 6) part-to-whole 7) absolute thinking 8) covariance (increasing->increasing or decreasing->decreasing) 9) invariance (different sizes, but all all have equal sides)  10) unit(izing) 11) relative thinking 12) direct variation 13) inverse variation

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