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dating back dated back to dating back to dated from
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dated from began with started with opened from
dating back dated back to dating back to dated from
had become wasbecoming has become isbecoming
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ωBC≠0，εBC≠0 ωBC=0，εBC=0 ωBC≠0，εBC=0 ωBC=0，εBC≠0
concerning about regarding with
were known of the oldest paintings the oldest of known paintings were the oldest known were painting were the oldest known paintings
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