code: def _type_priority(ifo, ftype, trend=None):
      
      # if looking for a trend channel, prioritise the matching type
      for trendname, trend_regex in [
              ('m-trend', MINUTE_TREND_TYPE),
              ('s-trend', SECOND_TREND_TYPE),
      ]:
          if trend == trendname and trend_regex.match(ftype):
              return 0, len(ftype)
  
      # otherwise rank this type according to priority
      for reg, prio in {
              HIGH_PRIORITY_TYPE: 1,
              re.compile(r'[A-Z]\d_C'): 6,
              LOW_PRIORITY_TYPE: 10,
              MINUTE_TREND_TYPE: 10,
              SECOND_TREND_TYPE: 10,
      }.items():
          if reg.search(ftype):
              return prio, len(ftype)
  
      return 5, len(ftype)
docs: Prioritise the given GWF type based on its name or trend status.
  
      This is essentially an ad-hoc ordering function based on internal knowledge
      of how LIGO does GWF type naming.