With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Instagram only supports fullscreen videos.
text_B: In probability theory and statistics , the Levy distribution , named after Paul Levy , is a continuous probability distribution for a non-negative random variable .. probability theory. probability theory. statistics. statistics. Paul Levy. Paul Levy ( mathematician ). continuous probability distribution. continuous probability distribution. random variable. random variable. In spectroscopy , this distribution , with frequency as the dependent variable , is known as a van der Waals profile .. spectroscopy. spectroscopy. `` van der Waals profile '' appears with lowercase `` van '' in almost all sources , such as  : Statistical mechanics of the liquid surface by Clive Anthony Croxton , 1980 , A Wiley-Interscience publication , ISBN 0-471-27663-4 , ISBN 978-0-471-27663-0 , ; and in Journal of technical physics , Volume 36 , by Instytut Podstawowych Problemow Techniki -LRB- Polska Akademia Nauk -RRB- , publisher  : Panstwowe Wydawn .. Naukowe. , 1995 , It is a special case of the inverse-gamma distribution .. inverse-gamma distribution. inverse-gamma distribution. It is one of the few distributions that are stable and that have probability density functions that can be expressed analytically , the others being the normal distribution and the Cauchy distribution .. stable. stability ( probability ). normal distribution. normal distribution. Cauchy distribution. Cauchy distribution
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