PrependTo
 Usage
• PrependTo[s, elem] prepends elem to the value of s, and resets s to the result.
Notes
• PrependTo[s, elem] is equivalent to s = Prepend[s, elem]. • PrependTo[s, elem] does not evaluate s. • You can use PrependTo repeatedly to build up a list, though Sow and Reap will usually be more efficient. • PrependTo works on SparseArray objects, returning ordinary lists if necessary. • New in Version 1.
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