ParallelCombine
ParallelCombine[f,h[e1,e2,…],comb] evaluates f[h[e1,e2,…]] in parallel by distributing parts of the computation to all parallel kernels and combining the partial results with comb.
ParallelCombine[f,h[e1,e2, …]] is equivalent to ParallelCombine[f,h[e1,e2,…],h] if h has attribute Flat, and ParallelCombine[f,h[e1,e2,…],Join] otherwise.
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