Use singleton
to wrap contents (tag, text, HTML, or lists) that should
be included in the generated document only once, yet may appear in the
document-generating code more than once. Only the first appearance of the
content (in document order) will be used.
1 2 3 | singleton(x, value = TRUE)
is.singleton(x)
|
x |
A |
value |
Whether the object should be a singleton. |
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