Ngày tải lên :
20/01/2014, 20:20
...
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a
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ω+
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...
]
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1 029 9109 32
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0
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++
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⎪
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⎪
⎪
⎪
⎨
⎧
=−===−=
=+
−=++
=++
−=⇒=+
+++
+
++++
−−−
−−−
...