With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Halle Berry's middle name is Marie.
text_B: In musical set theory , an interval class -LRB- often abbreviated  : ic -RRB- , also known as unordered pitch-class interval , interval distance , undirected interval , or '' -LRB- even completely incorrectly -RRB- as ` interval mod 6 ' '' , is the shortest distance in pitch class space between two unordered pitch classes .. musical set theory. set theory ( music ). pitch class space. pitch class space. pitch class. pitch class. For example , the interval class between pitch classes 4 and 9 is 5 because 9 − 4 = 5 is less than 4 − 9 = − 5 ≡ 7 -LRB- mod 12 -RRB- .. See modular arithmetic for more on modulo 12 .. modular arithmetic. modular arithmetic. modulo. modulo operation. The largest interval class is 6 since any greater interval n may be reduced to 12 − n.
not_related.