The voice synthesization processing unit synthesizes {HEAD ~ the voices} by, e.g., {TAIL ~ a voice rule synthesizing method} of synthesizing the voices from a character string 
by
The voice synthesization processing unit synthesizes { HEAD ~ the voices } by , e.g. , { TAIL ~ a voice rule synthesizing method } of synthesizing the voices from a character string
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH