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Teacher Liu wrote a "math problem" on the wall, so that the dumb head could play on the wall!

Teacher Liu wrote a "math problem" on the wall, so that the dumb head could play on the wall!

Teacher Liu wrote a "math problem" on the wall, so that the dumb head could play on the wall!
Teacher Liu wrote a "math problem" on the wall, so that the dumb head could play on the wall!
Teacher Liu wrote a "math problem" on the wall, so that the dumb head could play on the wall!
Teacher Liu wrote a "math problem" on the wall, so that the dumb head could play on the wall!
Teacher Liu wrote a "math problem" on the wall, so that the dumb head could play on the wall!
Teacher Liu wrote a "math problem" on the wall, so that the dumb head could play on the wall!

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