docs: def is_greater(a,b):
      """Check if position a is greater than position b
      This will look at chromosome and position.
      
      For example a position where chrom = 2 and pos = 300 is greater than a position where
      chrom = 1 and pos = 1000
      
      If any of the chromosomes is outside [1-22,X,Y,MT] we can not say which is biggest.
      
      Args:
          a,b(Position)
      
      Returns:
          bool: True if a is greater than b
      """
      
      a_chrom = CHROM_TO_INT.get(a.chrom,0)
      b_chrom = CHROM_TO_INT.get(b.chrom,0)
      
      if (a_chrom == 0 or b_chrom == 0):
          return False
      
      if a_chrom > b_chrom:
          return True
      
      if a_chrom == b_chrom:
          if a.pos > b.pos:
              return True
      
      return False