With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Macbeth is by English playwright William Shakespeare.
text_B: Colias grumi is a butterfly in the Pieridae family .. butterfly. butterfly. Pieridae. Pieridae. It is found in north-western China -LRB- described from Nanshan -RRB- .. China. China. Nanshan. Qilian Mountains
not_related.