Specifics: You start from the right of the chart and move left. For lower/demand/upward sloping trend line: Locate first low for which bar lows immediately to right and left are both higher and close two bars before is also higher. That is the first point. Then find the next lower point to the left, using those same criteria. Then connect those two points and project out to the right.
For upper/supply/downward sloping version, obviously use the reverse.
For people who haven't used these before, try them out for awhile; there is something almost eerie about how helpful they are.
Thank you.
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