wish you were here - Pink Floyd

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So, so ya think you can tell
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heaven from hell, blue skies from pain, can you tell a green field
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from a cold steel rail? A smile from a veil? Do ya think ya can tell?
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did they get you to trade, your hero's for ghosts, hot ashes for trees
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hot air for a cool breeze, cold comfort for change, did you exchange,
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a walk on part in the war, for a lead role in a cage?