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> s := "some string";
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s := "some string"
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> t := "some string";
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t := "some string"
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> evalb( s = t ); # they are equal
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true
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> addressof( s ) = addressof( t ); # not just equal data, but the same address in memory
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3078334210 = 3078334210
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> u := t: # copy reference
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