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a list in which each of the elements is an atomic vector, and all of the elements have the same length
a list of variables of the same length with unique row names, given class "data
a list of vectors, factors, and/or matrices all having the same length (number of rows in the case of matrices)
a list, where the objects are the columns as vectors
an R object made up of columns of equal length and each column is a sub-object that can be referenced by name
a special list where each row is a record and each column is a field (of potentially different modes)
a special matrix where all the variables are stored as columns and each has the same length
Consists of the Destination Address, Source Address, Length Field, LLC Data, Pad and Check Frame Sequence.
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