code: public List<ISubmission> omit(List<ISubmission> submissions, ISubmitter submitter){
  		
  		ArrayList<ISubmission> filteredSubmissions = new ArrayList<ISubmission>();
  		
  		for (ISubmission submission: submissions){
  			if (!submission.getSubmitter().equals(submitter)){
  				filteredSubmissions.add(submission);
  			}
  		}
  		
  		return filteredSubmissions;
  	}
docs: Filter a set of submissions removing any from the supplied submitter
  @param submissions the list of submissions to filter
  @param submitter the submitter whose submissions should be omitted from the results
  @return the filtered list of submissions