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## unmatch
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### Instructions
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Write a function, `Unmatch`, that returns the element of the slice that does not have a correspondent pair.
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- If all the number have a correspondent pair, it shoud return `-1`.
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### Expected function
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```go
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func Unmatch(a []int) int {
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}
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```
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### Usage
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Here is a possible program to test your function :
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```go
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package main
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import (
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"fmt"
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piscine ".."
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)
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func main() {
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a := []int{1, 2, 3, 1, 2, 3, 4}
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unmatch := piscine.Unmatch(a)
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fmt.Println(unmatch)
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}
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```
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And its output :
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```console
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student@ubuntu:~/[[ROOT]]/test$ go build
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student@ubuntu:~/[[ROOT]]/test$ ./test
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4
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student@ubuntu:~/[[ROOT]]/test$
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```
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