Stacks
the code
the call stack
the implementation
cost of each operation
the agent
route walked
visited
start
goal
the agent, where it is now
the route it walked to get there
already visited
start
goal
given
placed by the search
cell being decided
digit rejected
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Step
Play
Restart
Speed
or drive it yourself
push
pop
top
empty
grab the middle one
tidy up