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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
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