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## printcomb
### Instructions
Write a function that prints in ascending order on a single line all unique combinations of three different digits so that the first digit is lower than the second and the second is lower than the third.
These combinations are separated by a comma and a space.
### Expected function
```go
func PrintComb() {
}
```
### Usage
Here is a possible program to test your function :
```go
package main
import piscine ".."
func main() {
piscine.PrintComb()
}
```
This is the incomplete output :
```console
$ go run . | cat -e
012, 013, 014, 015, 016, 017, 018, 019, 023, ..., 689, 789$
$
```
`000` or `999` are not valid combinations because the digits are not different.
`987` should not be shown because the first digit is not less than the second.
