The odd one out

Challenge #1 in the Visual versus Frontal Cortex series. Hosted by Xscream.
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Find something repetitive, with one exception. For example a lot of apples with one pear, orange flowers with just one yellow one in between, or some young people with one old person in their middle.
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Submitted: Thursday, 21st January, 2010 01:31 (GMT)
Taken: Wednesday, 13th October, 2004
Focal length: 7.09 mm
Shutter speed: 1/125 sec
Aperture: F2.8
ISO: 3
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Views: 308
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