def index
    if @series_statement
      @series_statement_merges = @series_statement.series_statement_merges.order('series_statement_merges.id').page(params[:page])
    elsif @series_statement_merge_list
      @series_statement_merges = @series_statement_merge_list.series_statement_merges.order('series_statement_merges.id').includes(:series_statement).page(params[:page])