With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Puerto Rico is an island with a population of 3.4 million.
text_B: Drago Matanovic was the author of numerous books and textbooks on electrical engineering published in Slovene from the 1930s to the 1950s .. electrical engineering. electrical engineering. Slovene. Slovene language. In 1951 he won the Levstik Award for his book Pogled v elektrotehniko -LRB- A Look at Electrotechnics -RRB- .. Levstik Award. Levstik Award
not_related.