{HEAD ~ The cycle} is then repeated a sufficient number of times to transfer a sufficient amount of gas from {TAIL ~ the gas supply line} to the on board storage, at the necessary pressures 
{ HEAD ~ The cycle } is then repeated a sufficient number of times to transfer a sufficient amount of gas from { TAIL ~ the gas supply line } to the on board storage , at the necessary pressures
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH