Add '-R' option to assign
When set, randomizes the order of nodes before making pclasses. This has the effect of putting different nodes at the 'front' of the pclass, The idea is to avoid 'hot spots' of nodes that get over-used simply because they happen to appear earlier in the .ptop file. NB: because STL seems to use a different source of randomness, using this with '-s' to set a seed does *not* make assign deterministic.
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