What does 5LL mean in DBFZ?

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New to fighting games and having trouble reading combos. I understand that 5L stands for standing light attack in Dragon ball FighterZ but can't find a source explaining the extra L in 5LL. Also there is an instance of triple L. Here's the source http://www.dustloop.com/wiki/index.php?title=DBFZ/Trunks/Combos
Can anyone help? Thanks in advance.
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What do the symbols mean in DBFZ?
This combo begins with 5M, 2M or 6H, which is anime fighting game notation with the Light, Medium, Heavy and Special attack buttons Dragon Ball FighterZ uses. So, you can start this combo with something as simple as pressing medium attack, or down and medium attack, or forward and heavy attack.What does 6H mean in FighterZ?
Down and heavy attack, or 2H in 'anime' notation is one of your go-to attacks in Dragon Ball FighterZ. When players are coming straight at you with Super Dashes, or even jumping a lot, you can hammer it home with a down and heavy attack.What does 2H mean in DBFZ?
Quarter circle forward and quarter circle back. For super the motion on your controller should be down, down forward, forward, then r1. If you are using d pad then just slide your thumb from down to forward then press the button. This my take some practice but take it slow then gradually get faster.Dragon Ball FighterZ Fighting Game Terminology EXPLAINED
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Images: Craig Adderley, Daniel Torobekov, Pixabay, Jim Fawns