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For a CAT DILR caselet involving 4 people × 4 attributes (favourite colour, day of birth, sport, food), the most efficient setup is:
ASketch a 4 × 4 grid with tick or cross per cell
BMemorise the constraints purely in your head only
CRe-read the entire caselet for every single question
DSet up algebraic equations with sixteen variables
Answer & Solution
Correct answer: A. Sketch a 4 × 4 grid with tick or cross per cell
Grid layout exposes constraints; each ✓ knocks out (n-1) other cells. Memorisation and algebra are both slower than the pen-and-paper grid.
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