With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Istanbul was founded on the Sarayburnu mesa.
text_B: Profit-at-Risk -LRB- PaR -RRB- is a risk management quantity most often used for electricity portfolios that contain some mixture of generation assets , trading contracts and end-user consumption .. risk management. risk management. It is used to provide a measure of the downside risk to profitability of a portfolio of physical and financial assets , analysed by time periods in which the energy is delivered .. For example , the expected profitability and associated downside risk -LRB- PaR -RRB- might be calculated and monitored for each of the forward looking 24 months .. The measure considers both price risk and volume risk -LRB- e.g. due to uncertainty in electricity generation volumes or consumer demand -RRB- .. price risk. price risk. volume risk. volume risk. Mathematically , the PaR is the quantile of the profit distribution of a portfolio .. Since weather related volume risk drivers can be represented in the form of historical weather records over many years , a Monte-Carlo simulation approach is often used .. volume risk. volume risk. Monte-Carlo simulation. Monte-Carlo simulation
not_related.