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## printcombn
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### Instructions
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- Write a function that prints all possible combinations of **n** different digits in ascending order.
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- n will be defined as : 0 < n < 10
below are your references for the **printing format** expected.
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- (for n = 1) '0, 1, 2, 3, ...8, 9'
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- (for n = 3) '012, 013, 014, 015, 016, 017, 018, 019, 023,...689, 789'
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### Expected function
```go
func PrintCombN(n int) {
}
```
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### Usage
Here is a possible [program](TODO-LINK) to test your function :
```go
package main
import piscine ".."
func main() {
piscine.PrintCombN(1)
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piscine.PrintCombN(3)
piscine.PrintCombN(9)
}
```
And its output :
```console
student@ubuntu:~/[[ROOT]]/test$ go build
student@ubuntu:~/[[ROOT]]/test$ ./test
0, 1, 2, 3, 4, 5, 6, 7, 8, 9
012, 013, 014, 015, 016, 017, 018, ... 679, 689, 789
012345678, 012345679, ..., 123456789
student@ubuntu:~/[[ROOT]]/test$
```