Check if data is the same as previous - twig

Question

I want to know if it's possible to look at what Twig "print" before something coming. Let me explain. I generate a list like :
Actual case :
Item 1
Item 2
Item 3
Item 4
Item 5
Item 6
...
It might be possible that "Item 5" === "Item 1" (for exemple), and I don't want to print the same value twice. I want something like that :
Item 1
Item 2
Item 6
Item 3
Item 4
...
If we take the actual case, it may be possible that "Item 2" === "Item 4", for exemple, and I want :
Item 1
Item 3
Item 2
Item 5
Item 6
...
Here my Twig code :
{% for underActivity in activity.underActivities %}
{% for indice in underActivity.indications %}
{% for adjusting in indice.adjustings %}
{% if adjusting is not null %}
<li>{{adjusting.name}}
<ul>
{% if indice.indicationPostAdjusting == "Green" %}
<li class="text-success">{{underActivity.name}}</li>
{% elseif indice.indicationPostAdjusting == "Orange" %}
<li class="text-warning">{{underActivity.name}}</li>
{% else %}
<li class="text-danger">{{underActivity.name}}</li>
{% endif %}
</ul>
</li>
{% endif %}
{% endfor %}
{% endfor %}
{% else %}
<p>Aucun aménagement n a été trouvée.</p>
{% endfor %}
...
Do you have any ideas ?
-- UPDATE --
I have this :
and I want this :
Travailler en binôme
Toquer à la porte
Signaler la présence dans la chambre
And :
Surélever la table
Ouverture automatique
Ouvrir les volets
To have something like that, at the final :
Travailler en binôme
Toquer à la porte
Signaler la présence dans la chambre
Surélever la table
Ouverture automatique
Ouvrir les volets
-- UPDATE 2 --
I've tried to create the array with datas that I want. Here is my code inside my controller :
foreach ($indications as $key => $value) {
foreach ($value as $k => $indication) {
$datas[] = [
"adjusting" => $indication->getAdjustings(),
"underActivity" => $indication->getUnderActivities(),
];
}
}
And that's what I got :
So now, how can I have the "name" of adjusting and underActivity ? because the "getName()" function doesn't work ? And that's what you want to see ?