Definition: In the context of mathematics, a "cliquer" is a function that takes a list of numbers and returns a new list where each element has been duplicated. For example:
```python
def cliquer(numbers):
return [x
2 for x in numbers]
```
This function creates a new list with every second element from the input list, effectively doubling each element.
In Python, you could use this function as follows:
```python
numbers = [1, 2,
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