α αα α α°α ααα α¨αα³ αα¨αα©α°αα½ α°αα£αα«αΈαα α ααΈαα α¨ααα αα α«ααΈαα α¨αα₯α₯ αα©αα΅ αα° 3 αα₯α α₯ α½αααα’
α’α«αͺ α αααΆ π
α’α«αͺ α αααΆ π