Discussion
What does the least constraining value heuristic choose?
Answer: B
Having chosen a variable, trying the value that leaves the most flexibility elsewhere makes a solution more likely to be found without backtracking. Note that it runs opposite to the variable heuristic: choose the most constrained variable but the least constraining value. That asymmetry is not accidental, since one seeks to detect failure early and the other to avoid causing it, and noticing the difference is what makes both memorable.
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