DocumentationMathematicaThe Mathematica BookMathematica Reference GuideSome General Notations and Conventions
A.3.5 Sequence Specifications
Specifications for sequences of parts.
The sequence specification m, n, s corresponds to elements m, m + s, m + 2s, ... , up to the largest element not greater than n.
Sequence specifications are used in the functions Drop, Ordering, StringDrop, StringTake, Take and Thread.
m, n, s
corresponds to elements m, m + s, m + 2s, ... , up to the largest element not greater than n. 
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