With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Jackie Evancho has three Billboard 200 top 10 debuts.
text_B: Distonic ions are chemical species that contain 2 ionic charges on the same molecule .. chemical. Chemical substance. molecule. molecule. The charges must be separated by two or more carbon. or hetero atoms to count as distonic -LRB- distant -RRB- .. Otherwise it is a gitonic -LRB- close -RRB- ion .. For example , the acid-catalyzed Grewe-cyclization is a well-known reaction based on formation of a distonic ion , initiating the ring closing step as a superelectrophile .. Grewe-cyclization. Grewe-cyclization. Distonic radical ions were first discovered in the gas phase by Michael L. Gross .. gas. gas. phase. Phase ( matter ). Michael L. Gross. Michael L. Gross ( chemist ). In recent years there has been a tremendous effort to identify new distonic species , characterize their reactivity , and measure their stability .. reactivity. reactivity ( chemistry )
not_related.