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The key (abstract (provide solution (problem (puzzle)), clue (detective),…
The key
abstract
a deciding factor
provide solution
problem
puzzle
clue
detective
instruction to decode message
encyrption
Alan Turing
enigma
WWII
tone
photograph
switch
electric circuit
harmonies
music
circle of fifth
physical
metal
serrated
sawlike
open or close sthg
door
hallway
security
lock
keyhole
have button
keypad
computer keyboard