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Sectioning Commands - @3@@PREFACESECTION@1.

The @3@@PREFACESECTION@1 command has the form:

@3@@PREFACESECTION(title)@1

where @3title@1 is the title of the preface
concerned, eg:

@3@@PREFACESECTION(Introduction)@1

A @3@@PREFACESECTION@1 command produces a centred, 
unnumbered, capitalised preface heading, in
large or boldface type, and which is set off
from the surrounding text.

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R.HARE, TRAINING GROUP, ERCC, 59 GEORGE SQUARE. SCRIBE 3 SLIDE 31.
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