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### Datenerfassung
Seite: https://de.serlo.org/mathe/60027/aufgaben-zu-parallelen-und-senkrechten-geraden
Datum: 11. Februar 2021
Screenshot:
![grafik](https://user-images.githubusercontent.co…
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Right chosen letters are not highlighted in green for all letters in exercise "markieren sie alle (A/...)".
It should be clearly visible, that the participant's choice of letter was right by being …
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Al proyecto le falta la implementacion de que si el ultimo viaje fue un trasbordo, el proximo no pueda serlo
https://github.com/Ignacioe/TrabajoTarjeta2018/blob/master/src/Tarjeta.php
https://github…
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Follow up of https://github.com/serlo/database-layer/pull/428: Add position inside the exercise folder for the default name of exercises and exercise groups:
```
X. Aufgabe aus ""
```
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Jira issue originally created by user machete:
Running the code on different environments for a while now, I have never had any problems. Recently I installed the code onto a different server and I'v…
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Sometimes we have content that is not valid (for example, someone puts as plugin id `9619 `, trailing space).
Currently backend just saves, without questioning.
Should we add some kind of validatio…
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### Datenerfassung
Datum: 19. Februar 2021
Seite: https://frontend.serlo.org/mathe/25621/aufgaben-zur-kombinatorik-im-typischen-sinn
Referenz: (1337 Aufrufe, 60-86% extern, 523 AphA)
Screenshot:…
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Currently, if we remove `serializableCheck: false` from the store configuration, we will get errors indicating that we have non-serializable values in the state. Why this is bad is explained [here](ht…
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Holaa. Como un conectivo ternario como M puede ser funcionalmente completo?? Ósea, tengo entendido que un grupo de conectivos podría serlo, así como la negación y la disyunción, pero como lo puede se…
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**Problem**: text in the formula field has a suboptimal font
**Request**: improve math font
**Source**: old backlog document
More infos: [Here](https://de.serlo.org/community/241639/testartikel…