Graphs and trees

?
F M V F K E P L X P P
G E K L X Q P K L R W
K J M F I F O I I N F
P A S Y N L F V Q P C
C M K H S O X U X P Q
H J F L C Q J O R B W
D L E L R D O T L U E
F F D Y O U K V Q G N
T Y J U O A J V W I B
S E Y P T P R E U T B
J X T V B Q A S L X T

Clues

  • What structure does a queue follow (4)
  • What structure does a stack follow (4)
  • Which node is read first in a pre order tree traversal (4)
  • Which node is read first in an in orde tree traversal (4)

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