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had benefited benefit benefited have benefited
has been decreasing had decreased decreased is decreasing
had melted has been melting melted is melting
closely closed close closer
had decreased decreased has been decreasing is decreasing
had decreased more than attach apply
as a result of on top of in front of in need of
had decreased decreased has been decreasing is decreasing
abstract solid fragile steady
had decreased decreased has been decreasing is decreasing
had decreased decreased is decreasing has been decreasing
had decreased decreased has been decreasing is decreasing
has been increasing have been increasing had increased have increased
are seeing; had increased will see；has been increasing see; increased have seen; is increasing
had benefited benefit benefited have benefited
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