A small ASCII art picture that helps clarify how the output was arrived at given the structure and how the tables relate in this particular example.
#
# This is how the tables relate to each other, in this
# xample. The records for each table are shown in parens.
#
# _____ table b (ab)
# /
# table a (aa)
# \______ table c (ac)
# | \____table d (ae, af)
# |
# |_____table e (ag)
#
# So traversing this tree once yeilds aa, ab, ac, ae, ag.
# going down it again (because table d has two records)
# gives ab, aa, ac, af, ag.
#
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