the machine further comprising {HEAD ~ a slide valve and control passages} through which {TAIL ~ a working medium} is conducted to and from the first and second working chambers, 
the machine further comprising { HEAD ~ a slide valve and control passages } through which { TAIL ~ a working medium } is conducted to and from the first and second working chambers ,
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH