The apparatus 1, wherein {TAIL ~ the apparatus} comprises a calculator which performs {HEAD ~ calculations} during the normal mode 
The apparatus 1 , wherein { TAIL ~ the apparatus } comprises a calculator which performs { HEAD ~ calculations } during the normal mode
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH