def subsequence?(seq1, seq2)
      i = j = 0
      loop do
        return true if i == seq1.size
        return false if j == seq2.size
        i += 1 if seq1[i] == seq2[j]
        j += 1
      end
    end
def subsequence?(seq1, seq2)
      i = j = 0
      loop do
        return true if i == seq1.size
        return false if j == seq2.size
        i += 1 if seq1[i] == seq2[j]
        j += 1
      end
    end
Returns whether or not `seq1` is a subsequence of `seq2`. That is, whether
 or not `seq2` contains every element in `seq1` in the same order (and
 possibly more elements besides).

 @param seq1 [Array]
 @param seq2 [Array]
 @return [Boolean]