One of {TAIL ~ the first and second stacks} of folded portions of {HEAD ~ the air bag} is disposed in an upper chamber portion , and the other stack of folded portions of the air bag is disposed in the lower chamber portion  
One of { TAIL ~ the first and second stacks } of folded portions of { HEAD ~ the air bag } is disposed in an upper chamber portion , and the other stack of folded portions of the air bag is disposed in the lower chamber portion
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH