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## union
### Instructions
5 years ago
Write a program that takes two `string` and displays, without doubles, the characters that appear in either one of the `string`.
The display will be in the order that the characters will appear on the command line and will be followed by a newline (`'\n'`).
If the number of arguments is different from 2, then the program displays a newline (`'\n'`).
### Usage
```console
$ go run . zpadinton paqefwtdjetyiytjneytjoeyjnejeyj | cat -e
zpadintoqefwjy$
$ go run . ddf6vewg64f gtwthgdwthdwfteewhrtag6h4ffdhsd | cat -e
df6vewg4thras$
$ go run . rien "cette phrase ne cache rien" | cat -e
5 years ago
rienct phas$
$ go run . | cat -e
$
$ go run . rien | cat -e
$
$
```