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 | function waitForTick()
  return coroutine.yield()
end
function moveLeft(id, len, speed)
  local remaining = len / speed
  while (remaining > 0) do
    id:ponderable().vel.x = -speed
    remaining = remaining - waitForTick()
  end
end
function moveRight(id, len, speed)
  local remaining = len / speed
  while (remaining > 0) do
    id:ponderable().vel.x = speed
    remaining = remaining - waitForTick()
  end
end
 |