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Mirror : when you need to draw the same think to the other side of the drawing
Extend : when you need to extend the line to another line
mirror if you want to draw the same thing in the athor side
extend if you want to extend a ligne
mirror =insert
extend = insert
chamfer = insert
mirror = mi+enter
extend = ex+enter enter
chamfer = ch+enter+amount+enter
open youtube and see the orders
the write is not helpfull
