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ref: 8c88b934735a3d7668755b66b06b7305d03456c9 parent: 082449eaceb7dfcee787c7fd00b6459b8cb35492 author: sijchen@cisco.com <sijchen@cisco.com> date: Wed Feb 15 10:37:39 EST 2017
add support for bConstraintSet4Flag and bConstraintSet5Flag