With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Catalyst is a rock song.
text_B: STS-6 was the sixth NASA Space Shuttle mission and the maiden flight of the Space Shuttle Challenger .. NASA. NASA. Space Shuttle. Space Shuttle. Launched from Kennedy Space Center on 4 April 1983 , the mission deployed the first Tracking and Data Relay Satellite , TDRS-1 , into orbit , before landing at Edwards Air Force Base on 9 April .. Kennedy. Kennedy Space Center. Edwards. Edwards Air Force Base. Kennedy Space Center. Kennedy Space Center. Tracking and Data Relay Satellite. Tracking and Data Relay Satellite. TDRS-1. TDRS-1. Edwards Air Force Base. Edwards Air Force Base. STS-6 was the first Space Shuttle mission during which a spacewalk was conducted , and hence was the first in which the Extravehicular Mobility Unit -LRB- EMU -RRB- was used .. Space Shuttle. Space Shuttle. spacewalk. Extravehicular activity. Extravehicular Mobility Unit. Extravehicular Mobility Unit
not_related.