Likewise, if Ω is {HEAD ~ an operator} acting on {TAIL ~ qubit κi}, define 
Likewise , if Ω is { HEAD ~ an operator } acting on { TAIL ~ qubit κi } , define
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH