(S (S (ADVP (RB So) (RB far)) (COMMA ,) (S (BASENP (JJ Pakistani) (NNS officials)) (VP (VBP have) (VP (VBN reported) (SBAR (IN that) (S (S (BASENP (NN 163) (NNS militants)) (VP (VBP have) (VP (VBN been) (VP (VBN killed))))) (COMMA ,) (SBAR (IN while) (S (BASENP (DT the) (NN military)) (VP (VBD sustained) (BASENP (NN 23) (NNS casualties))))))))))) (PERIOD .))