I assume you are looking for a series of tangential arcs, with no
straight segments and no elliptical segments.
ARC will give you continuous tangential arcs of the same or different
radii if after completing the first one you hit Enter twice to continue
the command by reusing the end point of the first arc as the start point
of the next. I usually rough out a complex curve that will require
tangential arcs with a polyline first, then trace over it with the arcs.
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