(IP (NP-SBJ (NP (CP (WHNP-1 (-NONE- *OP*))
(CP (IP (NP-SBJ (-NONE- *pro*))
(VP (VP (VV 书写)
(NP-OBJ (-NONE- *T*-1)))
(CC 及)
(VP (VV 发出)
(NP-OBJ (-NONE- *T*-1)))))
(DEC 的)))
(NP (NN 信件)))
(NP (NN 数量)))
(VP (ADVP (AD 也))
(ADVP (AD 不))
(VP (VV 受)
(NP-OBJ (NN 限制)))))
ARG0: *pro*
ARG1: *T*-1
REL: 书写