Hybrid attack, alternating between modified and unmodified passwords

[slyexe]

I would like hashcat to use a wordlist and use each word twice: first "as is", and then with a "1" appended to it.
Looks like the "hybrid attack" should be able to do it. I can even see an example what to do if I wanted to append different digits here: https://hashcat.net/wiki/doku.php?id=hybrid_attack
But how do I make it alternate between appending something and nothing?

Thanks!

That would be called rules. You would have to create your ruleset to apply whatever expected outcome by reading the Wiki. However, you could also always use a combinator attack. There is several ways to achieve what you are defining in your initial statement. 

Rules would be the best case scenario in my opinion as you can apply several different parameters to your wordlist, such as adding digits at the end or capitalizing the first character or not altering the wordlist at all, there is plenty of other options. There is also pre-created rulesets within the hashcat folder. 

https://hashcat.net/wiki/doku.php?id=rule_based_attack