$\"\"$

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$\"\"$ means $\"\"$ is a factor of $\"\"$ times.

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The base is 4.

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The exponent is 6.

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$\"\"$ $\"\"$ $\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ ) $\"\"$

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The value of the expression is $\"\"$ .