When the voting booths are to be erected, {TAIL ~ the retaining clips} are released to separate {HEAD ~ the two base members} 
When the voting booths are to be erected , { TAIL ~ the retaining clips } are released to separate { HEAD ~ the two base members }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD