its easier on a desktop or laptopdrawing tools -- click the...

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    its easier on a desktop or laptop
    drawing tools -- click the arrow (red circle top left) --- parallel channel (then just click Left point and Right point and it hover mouse down to draw it)

    drawing tools might be a different location if you're on a mobile

    https://hotcopper.com.au/data/attachments/4021/4021989-80ab54d115d208290611e379031994a8.jpg

 
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