Answer:
1. A violation of co-occurence?
2. Including adding needed?
3. As needed was needed?
Step-by-step explanation:
1. Co-occurence refers to when terms occurs in the same document that don´t necessarily need to be adjacent. It has nothing to do with syntax, the linguistic study of the rules that govern our sentences. Furthermore, violation is a quite violent term in this innocent case.
We can happily shorten the sentence in:
First state whether they are syntactically ill-formed because of word order. Period.
2. The double use of progressive tense (including adding) is incorrect; and needed is not needed either. So it could be something like:
... This may include adding arguments.
3. I would substitute As for If. Or maybe get rid of the first needed anyway. Two times needed doesn´t help to create a nicely and well formed sentence. So let´s think of something else:
Explain what specifically was needed to create etc.