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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Ohio Fallen Soldier Memorial, Sunbury, Ohio
"I said face front!"
The soloist
Swans
I Swear
Why is it that someone never gets the word?
No Room at the Inn
Outstanding
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Black sheep
The black sheep of the family
The sinner
Neighbors
One Open Door
The Lookout
One of our Pods is Missing
Red Baloon
Birdy
Go!
cock of the walk
I choose RED
Live Me Alone
Odd one out
The tallest among all
The show off
One guy was taller
I differ...
Berries
the fall
Not forgotten
I HATE being photographed without a tan.
He always was a little odd
Church Pews and Hymnals
Plain vs victorian
What street did you say!
can I join?
Blue!
Calm down everybody ... I'm in charge here!!!
The intruder
Hey, you are going the wrong way!!
Yellow among red
3 forks and 1 spoon
a rose between flowers
The Calm Before the Storm
Rose
The black sheep...
Football Stadium
The reason you became my Ex
What am I doing here?...
Oops
Survivor
Small Formation
A round Lego in a Square world
Who's the guy with the long neck ?
The Blessed one
dare to be different
There's Always One...
His beak can't hold more than his belly can..
I see you
One of the gang?
The stranger amongst us
Odd
old trucks
Red.
Isolation
I got the Blue
Behind Schedule
Bocanera.
Against The Flow
Purple
Yummy!
2th by air. 1th  by water.
Exam passed
Ballet Recital
Dude!
Survival
Happy Outsider
The Queen of Hearts........
Newcomer
A Father Courage (Homage to)
A poppy in a wheat field
citrus fruit
Odd shue choice after one days hiking
the healthy one!!!!
mnms
Standing High
100 rubles
Early at work
Dark rock
"Can I Join?"
White versus brown
Lucky Lady ?
Untitled
Black and White
Ripe!
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