Check for more than one claimer

[elizlee]

I know that we discussed how in most cases, there will be only one claimer mentioned if any, but I've seen in the test documents I'm using that there are a couple of instances where there are two claimers (e.g. “researchers and studies say“), and because of how this is represented in the AMR graphs, the value extracted ends up being something nonsensical (e.g. "and studies researchers and").

My goal would be to look for this "X and Y claimed..." structure and then either return a) only the first speaker in the set or b) a single phrase that mentions all of the claimers, like "researchers and studies"

Since this is still relatively uncommon, this will be low-priority.

[joecummings]

Let @dan know because he is only expecting one claimer.