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A pencil is a writing tool with a stick of carbon core and a layer of protective wood.

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A pencil is a tool used to write and can be erased after writing.

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A pencil is a simple tool that is commonly used for writing.

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Pencil is a tool for writing, marking and revising.

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A pencil is something you can use to write on paper and what you write can be easily erased by an eraser.

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Pencil is a tool you can write with which consists of wood and graphite.

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Pencil is a tool that contains a graphite core, and can be used for writing.

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A penci is an instrument used for handwritting.

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A pencil is what we called a kind of writing tool made of wood or plastic.

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A pencil is a tool used for writing, drawing, and marking and comprised of a slender and cylindrical strip of material that can leave marks.

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1. This situation damages people’s short-term interests, thus impeding governments from instituting related policies.
4. The relationship between individual’s heart rate and exercise intensity is one of the most important indicators of one’s physiology.
7. Although the accessibility of this model has been proved by many case, a plenty of research is needed to adapt it to situations in different countries.

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2. As technology advances, a rapid increase in production is predicted.
5. Financial analysts must consider how to improve their competitiveness.

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3. User feedback can enhance effectiveness by eliminating undesired choices and simplifying problems.
6.  As urban areas develop, landscapes become impermeable and dry since open land, vegetation and waters are replaced by buildings.

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8. These theories predict that education provision can be more efficient through more competition brought by greater choice.

9. Thus, theoretical chemists addressed this problem with QM/MM method.

10. DFT is much more accurate than other methods.