code: def combine_elem(ind1, ind2):
      
      def inner(seq):
          shift = 2**16
          if seq[ind1] < 0:
              seq[ind1] += shift
          if seq[ind2] < 0:
              seq[ind2] += shift
          return (seq[ind1] << 16) | seq[ind2]
      return inner
docs: Create a function to combine two specified product-specific blocks into a single int.