Statistics for Groups of Four - Missing Item

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Hint	Answer	% Correct
Autumn, Summer, Winter	Spring	96%
East, North, West	South	95%
Air, Fire, Water	Earth	92%
Down, Left, Up	Right	91%
Clubs, Hearts, Spades	Diamonds	84%
England, Scotland, Wales	Northern Ireland	84%
Alto, Bass, Soprano	Tenor	71%
Breaststroke, Butterfly, Freestyle	Backstroke	69%
Lincoln, Roosevelt, Washington	Jefferson	58%
Gas, Liquid, Solid	Plasma	57%
Death, Pestilence, War	Famine	52%
Black, Cyan, Magenta	Yellow	44%
Laa-Laa, Po, Tinky-Winky	Dipsy	29%
Hokkaido, Honshu, Shikoku	Kyushu	26%
Cytosine, Guanine, Thymine	Adenine	20%
Europa, Ganymede, Io	Callisto	19%
Atmosphere, Biosphere, Lithosphere	Hydrosphere	9%
Price, Product, Promotion	Place	8%
Attack, Sustain, Release	Decay	4%
Cups, Pentacles, Swords	Wands	3%