{HEAD ~ An integrator} includes {TAIL ~ a source} of current responsive to the signal to be integrated 
includes
{ HEAD ~ An integrator } includes { TAIL ~ a source } of current responsive to the signal to be integrated
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH