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  current expression and runs a copy of the \R interpreter which has
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  current expression and runs a copy of the \R interpreter which has
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  access to variables local to the environment where the call took
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  access to variables local to the environment where the call took
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  place.
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  place.
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  Local variables can be listed with \code{ls}, and manipulated with \R
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  Local variables can be listed with \code{ls}, and manipulated with \R
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  expressions typed to this sub-interpreter.  The interpreter copy is
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  expressions typed to this sub-interpreter.  The sub-interpreter can be
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  exited by typing \code{c}.  Execution then resumes at the statement
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  exited by typing \code{c}.  Execution then resumes at the statement
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  following the call to \code{browser}.
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  following the call to \code{browser}.
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  Typing \code{n} causes the step-through-debugger, to start and it is
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  Typing \code{n} causes the step-through-debugger, to start and it is
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  possible to step through the remainder of the function one line at a
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  possible to step through the remainder of the function one line at a