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}


# $root = $obj->_transform($depth, $permutation)
#
# $permutation is an arrayref of segments (Text::Glob::Expand::Segment
# instances) representing a permutation generated from a
# Text::Glob::Expand expression (i.e. one of the elements in the
# result from from _traverse).
#
# $depth is a depth to partition it by (in hindsight, perhaps this
# could be computed from the first element's depth?).
#
# The result $root is the root node of a tree structure describing the
# structure of the permutation (a Text::Glob::Expand::Permutation
# instance), by using the segments' depth attribute.  This tree is
# designed to allow the placeholders in formats to be mapped to
# expansions.
#
# See the POD within Text::Glob::Expand::Permutation for a description of 
# the structure of this result.