| sym | - the section symmetries
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| stratum | - the stratum value in the label that we are assigning symmetries for
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| size | - the number of dofs for points in the stratum of the label
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| minOrient | - the smallest orientation for a point in this stratum
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| maxOrient | - one greater than the largest orientation for a ppoint in this stratum (i.e., orientations are in the range [minOrient, maxOrient))
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| mode | - how sym should copy the perms and rots arrays
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| perms | - NULL if there are no permutations, or (maxOrient - minOrient) permutations, one for each orientation. A NULL permutation is the identity
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| rots | - NULL if there are no rotations, or (maxOrient - minOrient) sets of rotations, one for each orientation. A NULL set of orientations is the identity
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