def cancel_flanks(flavour)

      return unless h.flanks

      h.flanks.each do |flank_fei|

        @context.storage.put_msg(
          'cancel',
          'fei' => flank_fei,
          'parent_id' => h.fei,
            # indicating that this is a "cancel child", well...
          'flavour' => flavour)
      end
    end
def cancel_flanks(flavour)

      return unless h.flanks

      h.flanks.each do |flank_fei|

        @context.storage.put_msg(
          'cancel',
          'fei' => flank_fei,
          'parent_id' => h.fei,
            # indicating that this is a "cancel child", well...
          'flavour' => flavour)
      end
    end
Emits a cancel message for each flanking expression (if any).