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Bias and key levels / Support and resistance levels/pivot

Hi, Reference to my earlier discussion https://www.mql5.com/en/forum/127673 here is what i want to find out What exactly are the bias and key levels. Support and Resistance levels are developed because of price action where the price is bouncing up and down Pivot points can predict future support

Need to calculate bias and key level in current timeframe

i see green doted and continuous bias and key level lines in my M1 another time frame charts. i notice that marker reverse when reaching these lines. so i think a Expert Advisor can automatically open trades on these levels. so can somebody give me code that calculates all bias and key levels in