A set of clues compares people or things: 'Mia is taller than Leo', 'Leo is not as tall as Sam'. The student picks the list, from four, that puts them all in order.
The clues always pin down exactly one order. The same fact can be worded several ways ('taller than', 'shorter than', 'not as tall as'), so the order can't be read off the sentence shapes.
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