The method 13, wherein {HEAD ~ said Unet sequence} of {TAIL ~ operations} comprises a sequence of elementary operations on qubits 
The method 13 , wherein { HEAD ~ said Unet sequence } of { TAIL ~ operations } comprises a sequence of elementary operations on qubits
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH