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In figure 3.5 the stroke doubles back abruptly. In the letter
in figure 3.6 the front moves forward and returns. As long
as the stroke involves no rotation the front sweeps across an
area bounded by parallel lines (translation of the frontline).
When rotation is a factor, the front fans out.
In principle, there are two possibilities: for all the strokes
of a script, the front either moves in a single direction (this I
call an interrupted construction), or there are strokes in which
the front reverses its direction and turns back (this I call a returning
construction).
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