The Armed Forces Press Committee (COPREFA) admitted that the government troops sustained 11 casualties in these clashes, adding that they inflicted three casualties on the rebels.
COPREFA  had many casualties.
Because there was only 11 casualties and I didn't specify how many.
( z1 casualty :quant ( z2 many ) :poss ( z3 organization :name ( z4 name :op "COPREFA" ) ) )