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proposed O
approach O
is O
attractive O
because O
it O
provides O
an O
estimate O
of O
system O
performance O
under O
varying O
degrees O
of O
query-document O
term O
mismatch O
, O
it O
makes O
use O
of O
readily O
available O
test O
collections O
, O
and O
it O
does O
not O
require O
any O
additional O
relevance O
judgments O
or O
any O
form O
of O
manual O
processing O
. O