With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: John Lennon was a rock and roll artist.
text_B: There have been four ships of the Royal Navy name HMS Penzance , named for the port of Penzance in Cornwall .. Royal Navy. Royal Navy. Penzance. Penzance. Cornwall. Cornwall. The ships motto is Diligenter Pensa -LRB- Diligent thought -RRB- .. The first Penzance was a frigate of 1665. Penzance. Penzance. frigate. frigate. The second Penzance was a frigate of 1747. Penzance. Penzance. frigate. frigate. The third was a Hastings-class sloop launched in 1930 and torpedoed and sunk in 1940 whilst on convoy protection duty by .. The fourth and current is a Sandown-class minehunter launched in 1997 and commissioned in 1998 .. Category  : Royal Navy ship names. Royal Navy. Royal Navy
not_related.