Which pair does not represent a pair of resonance structures? 
Definitions:
Two-way ANOVA
A statistical method used to examine the influence of two different categorical independent variables on one continuous dependent variable.
Degrees of Freedom
The total count of distinct values or elements that may be given to a statistical distribution.
Randomized Block Design
An experimental design that groups subjects into blocks to account for variability among them and then randomly assigns treatments within these blocks.
Randomized Block Design
An experimental setup that groups experimental units into blocks to account for variability among them before testing different treatments.
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