Reap
 Usage
• Reap[expr] gives the value of expr together with all expressions to which Sow has been applied during its evaluation.
• Expressions sown using Sow[e] or Sow[e,  ] with different tags are given in different lists.
• Reap[expr, patt] reaps only expressions sown with tags that match patt.
• Reap[expr, { ,  , ... }] puts expressions associated with each of the  in a separate list.
• Reap[expr, patt, f] returns {expr, {f[ , { ,  , ... }], ... }}.
Notes
• Sow and Reap provide a convenient way to accumulate a list of intermediate results in a computation. • Reap accumulates expressions in the order in which Sow is applied to them. • Expressions sown with a particular tag are collected by the innermost Reap whose pattern matches the tag. • Reap[expr] is equivalent to Reap[expr, _]. • New in Version 5.
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