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    DRAW: RECTANGLE BETWEEN SELECTED LINES
RECL command draws a rectangle (or quadrilateral) between two selected lines or polyline segments. It allows you to close custom shaped holes easily.
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    HATCHES: DRAW HATCH BOUNDARY
HBO command can draw boundary of selected hatch pattern. This may help you recover some lost information from a drawing.
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    PLUMBING: DRAW DUCTS
After setting some parameters you may easily design ducts both inside and outside buildings.
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