(S (S (PP (IN By) (S (VP (VBG signing) (BASENP (DT the) (NN agreement))))) (COMMA ,) (S (BASENP (DT both) (NNS sides)) (VP (VBP agree) (S (VP (TO to) (VP (VP (VP (VB pull) (PRT (RP back))) (BASENP (PRPD their) (NNS forces))) (PP (TO to) (BASENP (JJ pre-conflict) (NNS positions))))))))) (PERIOD .))