With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Estella Warren is a person.
text_B: The up quark or u quark -LRB- symbol  : u -RRB- is the lightest of all quarks , a type of elementary particle , and a major constituent of matter .. quark. quark. elementary particle. elementary particle. matter. matter. elementary. elementary particle. It , along with the down quark , forms the neutrons -LRB- one up quark , two down quarks -RRB- and protons -LRB- two up quarks , one down quark -RRB- of atomic nuclei .. quark. quark. down quark. down quark. atomic nuclei. atomic nucleus. down. down quark. It is part of the first generation of matter , has an electric charge of + e and a bare mass of 1.8 -- .. matter. matter. first generation. generation ( physics ). electric charge. electric charge. bare mass. Quark#Mass. Like all quarks , the up quark is an elementary fermion with spin , and experiences all four fundamental interactions  : gravitation , electromagnetism , weak interactions , and strong interactions .. quark. quark. elementary. elementary particle. fermion. fermion. spin. spin ( physics ). gravitation. gravitation. electromagnetism. electromagnetism. The antiparticle of the up quark is the up antiquark -LRB- sometimes called antiup quark or simply antiup -RRB- , which differs from it only in that some of its properties have equal magnitude but opposite sign .. quark. quark. antiparticle. antiparticle. equal magnitude but opposite sign. additive inverse. Its existence -LRB- along with that of the down and strange quarks -RRB- was postulated in 1964 by Murray Gell-Mann and George Zweig to explain the Eightfold Way classification scheme of hadrons .. Murray Gell-Mann. Murray Gell-Mann. George Zweig. George Zweig. down. down quark. Eightfold Way. Eightfold Way ( physics ). The up quark was first observed by experiments at the Stanford Linear Accelerator Center in 1968 .. quark. quark. Stanford Linear Accelerator Center. Stanford Linear Accelerator Center
not_related.