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Sometimes we think that a drawing is correct, instead we do not realize that the lines that compose it are not perfectly horizontal / vertical or have a length with a dot (not integer). I made this lisp just to find these errors. By selecting the design, the design is recreated and the lines are colored: - Cyan Line Correct rotation and length (whole or half cm) - Green Line Rotation correct but incorrect length (2 or + decim. after dot) - Magenta Line Slightly incorrect rotation (< 1°) and correct length - Red Line Slightly wrong rotation (< 1°) and wrong length - Blue Line Rotation any (visible <> from 0-90-180-270) and length. correct - Yellow Line Rotation any and wrong length As you can see, the door and the left window have wrong lines. The roof has a blue and yellow color as the lines clearly have a rotation greater than 1 °. Verifline.mp4 PS. The design of this house is the project I made .... when I was 4 years old! ;) VERIFLINE.LSP