With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Scabies is caused by lice.
text_B: USS Perch -LRB- SS / SSP / ASSP  /  APSS / LPSS / IXSS -313 -RRB- , a Balao-class submarine , was the second submarine of the United States Navy to be named for the perch , a rather small European fresh-water spiny-finned fish .. submarine. submarine. United States Navy. United States Navy. perch. perch. The second Perch -LRB- SS -- 313 -RRB- was laid down 5 January 1943 by the Electric Boat Co. , Groton , Conn. ; launched 12 September 1943 ; sponsored by Mrs. David A. Hart ; and commissioned 7 January 1944 , Lt. Comdr. Blish C. Hills in command .. After shakedown she departed 19 February 1944 for Key West , Fla. , where she gave services to the Fleet Sound School .. Key West. Key West. She then sailed for Pearl Harbor , arriving 3 April .. Pearl Harbor. Pearl Harbor
not_related.