(supertux-sprite
  (action
    (name "walking-left")
    (hitbox 2.1 6.1 45.8 25.8)
    (images 
      "walk-0.png"
"walk-1.png"
"walk-2.png"
    )
  )
  (action
    (name "walking-right")
    (hitbox 2.1 6.1 45.8 25.8)
    (mirror-action "walking-left")
  )
)