Graphs and trees

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

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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