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