new_contents: import json
  from indra.statements import Activation, Agent
  
  def process_mentions(fname):
      with open(fname, 'r') as fh:
          jd = json.load(fh)
          mentions = jd['mentions']
  
      events = [m for m in mentions if m['type'] == 'EventMention']
      events = [e for e in events if len(e['arguments']) == 2]
      events = [e for e in events if 'cause' in e['arguments']]
  
      stmts = []
      for event in events:
          cause = event['arguments']['cause'][0]['text']
          effect = event['arguments']['effect'][0]['text']
          st = Activation(Agent(cause), Agent(effect))
          stmts.append(st)
      return stmts
  
  
subject: Add initial mention processing code