simple machines

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Across
  1. 3. two kids on a teeter totter
  2. 4. a twisty staircase that wraps around a pole
  3. 6. a axe chopping down a tree
Down
  1. 1. pulling up a tree house in a tree with rope
  2. 2. plane a car going up a hill
  3. 5. and axle a door knob turning