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1-
if pos.x > floor(pos.x)+0.5 then 
1+
pos.x = math.floor(pos.x+0.5)
2-
	if pos.z > floor(pos.z)+0.5 then
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pos.y = math.floor(pos.y+0.5)
3-
		<insert code here to place at {floor(pos.x)+1, floor(pos.y), floor(pos.z)+1}> 
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pos.z = math.floor(pos.z+0.5)
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	else
4+
<insert place code here>