With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Robin appeared in comic books published by DC Comics.
text_B: The Leibniz harmonic triangle is a triangular arrangement of unit fractions in which the outermost diagonals consist of the reciprocals of the row numbers and each inner cell is the absolute value of the cell above minus the cell to the left .. triangular. triangle. absolute value. absolute value. To put it algebraically , -LRB- where is the number of the row , starting from 1 , and is the column number , never more than r -RRB- and
not_related.