First, thank you so much for this package. I have been following along with the example pages and have been able to successfully plot a network diagram and identify communities with louvain detection. However, now I am running into a problem: I want to plot a subset of my corpus, so referred to your documentation on filtering with a for loop, like so: ```python RCfiltered = mk.RecordCollection() for R in RC: if R.title[0] == 'A': RCfiltered.addRec(R) ``` However, I am getting an error message: `AttributeError: 'RecordCollection' object has no attribute ‘addRec'` I have tried changing “addRec” to “add”, since I have seen that syntax elsewhere with other record collection objects, with seemingly no success. Any suggestions to move forward?