With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: A mole is not used as a breakwater.
text_B: A mole is a massive structure , usually of stone , used as a pier , breakwater , or a causeway between places separated by water .. stone. Rock ( geology ). pier. pier. breakwater. Breakwater ( structure ). causeway. causeway. The word comes from Middle French mole , ultimately from Latin moles , meaning a large mass , especially of rock , and it has the same root as molecule .. Middle French. Middle French. molecule. molecule. A mole may have a wooden structure built on top of it that resembles a wooden pier .. pier. pier. The defining feature of a mole , however , is that water can not freely flow underneath it , unlike a true pier .. pier. pier. The oldest known mole is at Wadi al-Jarf , an ancient Egyptian harbor complex on the Red Sea .. Wadi al-Jarf. Wadi al-Jarf
related.