Chalk writing on the blackboard:
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Ballpoint pen machine, press a button, write
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Take out a pencil from the pile.
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Stamp, Plastic seal
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Tape over carton, Tape holder
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Manual pencil sharpener
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Pencil writing on paper
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Tear off tape
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Pen Writing, Ink Dipping
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Eraser
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Pressing a button on a ballpoint pen
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Closes, Seal, pad opens
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Put ballpoint pen on paper
★★★★★