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\preformatted{  unit(rep(1, 3), c("npc", "strwidth", "inches"),
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\preformatted{  unit(rep(1, 3), c("npc", "strwidth", "inches"),
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  data = list(NULL, "my string", NULL))
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  data = list(NULL, "my string", NULL))
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}.
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}.
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  It is possible to subset unit objects in the normal way and to perform
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  It is possible to subset unit objects in the normal way and to perform
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  subassignment (see the examples),
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  \I{subassignment} (see the examples),
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  but a special function
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  but a special function
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  \code{unit.c} is provided for combining unit objects.
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  \code{unit.c} is provided for combining unit objects.
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  Certain arithmetic and summary operations are defined for
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  Certain arithmetic and summary operations are defined for
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  unit objects.  In particular, it is possible to add and subtract
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  unit objects.  In particular, it is possible to add and subtract